tootbot: fix missing imports from adding media downloads

zulip_bots/zulip_bots/tootbot.py

@@ -1,12 +1,15 @@
 
-
+import json
-import argh
 import logging
+import os
 import time
 
+import argh
 import mastodon
 from bs4 import BeautifulSoup
 
+from common import media
+
 from . import zulip
 from .config import get_config