Fix styling and handling of disabled components

Filter out null values from disabled components in "items"
Fix formatting on thrimshim arguments
Use enabled.<component_name> syntax to check enabled components, as they're essentially variables.

k8s.jsonnet

@@ -182,12 +182,15 @@
     },
   },
 
-  // The actual manifests.
-  // These are all deployments. Note that all components work fine if multiple are running
+  // The actual manifests to output, filtering out "null" from disabled components.
+  items: [comp for comp in $.components if comp != null],
+  
+  // These are all the deployments and services. 
+  // Note that all components work fine if multiple are running
   // (they may duplicate work, but not cause errors by stepping on each others' toes).
-  items: [
+  components:: [
     // The downloader watches the twitch stream and writes the HLS segments to disk
-    if $.config.enabled["downloader"] then $.deployment("downloader", args=$.config.channels + [
+    if $.config.enabled.downloader then $.deployment("downloader", args=$.config.channels + [
       "--base-dir", "/mnt",
       "--qualities", std.join(",", $.config.qualities),
       "--backdoor-port", std.toString($.config.backdoor_port),
@@ -195,7 +198,7 @@
     ]),
     // The restreamer is a http server that fields requests for checking what segments exist
     // and allows HLS streaming of segments from any requested timestamp
-    if $.config.enabled["restreamer"] then $.deployment("restreamer", args=[
+    if $.config.enabled.restreamer then $.deployment("restreamer", args=[
       "--base-dir", "/mnt",
       "--backdoor-port", std.toString($.config.backdoor_port),
       "--port", "80",
@@ -203,7 +206,7 @@
     // The backfiller periodically compares what segments exist locally to what exists on
     // other nodes. If it finds ones it doesn't have, it downloads them.
     // It can talk to the database to discover other wubloader nodes, or be given a static list.
-    if $.config.enabled["backfiller"] then $.deployment("backfiller", args=$.clean_channels + [
+    if $.config.enabled.backfiller then $.deployment("backfiller", args=$.clean_channels + [
       "--base-dir", "/mnt",
       "--qualities", std.join(",", $.config.qualities),
       "--static-nodes", std.join(",", $.config.peers),
@@ -215,39 +218,39 @@
     // Segment coverage is a monitoring helper that periodically scans available segments
     // and reports stats. It also creates a "coverage map" image to represent this info.
     // It puts this in the segment directory where nginx will serve it.
-    if $.config.enabled["segment_coverage"] then $.deployment("segment-coverage", args=$.clean_channels + [
+    if $.config.enabled.segment_coverage then $.deployment("segment-coverage", args=$.clean_channels + [
       "--base-dir", "/mnt",
       "--qualities", std.join(",", $.config.qualities),
       "--metrics-port", "80",
     ]),
     // Thrimshim acts as an interface between the thrimbletrimmer editor and the database
     // It is needed for thrimbletrimmer to be able to get unedited videos and submit edits
-    if $.config.enabled["thrimshim"] then $.deployment("thrimshim", args=[
+    if $.config.enabled.thrimshim then $.deployment("thrimshim", args=[
       "--backdoor-port", std.toString($.config.backdoor_port),
       "--title-header", $.config.title_header,
       "--description-footer", $.config.description_footer,
-      "--upload-locations", std.join(",", [$.config.default_location] + 
-      [location for location in std.objectFields($.config.cutter_config)
-      if location != $.config.default_location]),
+      "--upload-locations", std.join(",", [$.config.default_location] + [
+        location for location in std.objectFields($.config.cutter_config)
+        if location != $.config.default_location
+      ]),
       $.db_connect,
       $.clean_channels[0],  // use first element as default channel
       $.config.bustime_start,
-      ]
-    ),
+      ]),
     // Normally nginx would be responsible for proxying requests to different services,
     // but in k8s we can use Ingress to do that. However nginx is still needed to serve
     // static content - segments as well as thrimbletrimmer.
-    if $.config.enabled["nginx"] then $.deployment("nginx", env=[
+    if $.config.enabled.nginx then $.deployment("nginx", env=[
       {name: "THRIMBLETRIMMER", value: "true"},
       {name: "SEGMENTS", value: "/mnt"},
     ]),
     // Services for all deployments
-    if $.config.enabled["downloader"] then $.service("downloader"),
-    if $.config.enabled["backfiller"] then $.service("backfiller"),
-    if $.config.enabled["nginx"] then $.service("nginx"),
-    if $.config.enabled["restreamer"] then $.service("restreamer"),
-    if $.config.enabled["segment_coverage"] then $.service("segment-coverage"),
-    if $.config.enabled["thrimshim"] then $.service("thrimshim"),
+    if $.config.enabled.downloader then $.service("downloader"),
+    if $.config.enabled.backfiller then $.service("backfiller"),
+    if $.config.enabled.nginx then $.service("nginx"),
+    if $.config.enabled.restreamer then $.service("restreamer"),
+    if $.config.enabled.segment_coverage then $.service("segment-coverage"),
+    if $.config.enabled.thrimshim then $.service("thrimshim"),
     // Ingress to direct requests to the correct services.
     {
       kind: "Ingress",