Add keyboard shortcut for setting playback speed to 1x

thrimbletrimmer/edit.html

@@ -100,6 +100,7 @@
 					<li>Period (.): Forward 1 frame</li>
 					<li>Equals (=): Increase playback speed one step</li>
 					<li>Hyphen (-): Decrease playback speed one step</li>
+					<li>Backspace: Reset playback speed to 1x</li>
 					<li>
 						Left bracket ([): Set start point for active range (indicated by arrow) to active video
 						time

thrimbletrimmer/index.html

@@ -112,6 +112,7 @@
 					<li>Period (.): Forward 1 frame</li>
 					<li>Equals (=): Increase playback speed one step</li>
 					<li>Hyphen (-): Decrease playback speed one step</li>
+					<li>Backspace: Reset playback speed to 1x</li>
 				</ul>
 			</div>
 		</div>

thrimbletrimmer/scripts/keyboard-shortcuts.js

@@ -73,12 +73,6 @@ document.addEventListener("keypress", (event) => {
 		case "l":
 			videoElement.currentTime += 10;
 			break;
-		case "ArrowLeft":
-			videoElement.currentTime -= 5;
-			break;
-		case "ArrowRight":
-			videoElement.currentTime += 5;
-			break;
 		case ",":
 			videoElement.currentTime -= 1 / VIDEO_FRAMES_PER_SECOND;
 			break;
@@ -130,6 +124,11 @@ document.addEventListener("keydown", (event) => {
 		case "ArrowRight":
 			videoElement.currentTime += 5;
 			break;
+		case "Backspace":
+			event.preventDefault();
+			videoElement.playbackRate = 1;
+			document.getElementById("video-controls-playback-speed").value = 1;
+			break;
 		default:
 			break;
 	}