Don't show user as 'waiting for media' if they don't intend to publish

We don't expect them to be publishing on any transport; they might be a subscribe-only bot.

src/state/MediaViewModel.ts

@@ -601,7 +601,14 @@ export class RemoteUserMediaViewModel extends BaseUserMediaViewModel {
    * could be because either we or the remote party are still connecting.
    */
   public readonly waitingForMedia$ = this.scope.behavior<boolean>(
-    this.participant$.pipe(map((participant) => participant === null)),
+    combineLatest(
+      [this.livekitRoom$, this.participant$],
+      (livekitRoom, participant) =>
+        // If livekitRoom is undefined, the user is not attempting to publish on
+        // any transport and so we shouldn't expect a participant. (They might
+        // be a subscribe-only bot for example.)
+        livekitRoom !== undefined && participant === null,
+    ),
   );
 
   // This private field is used to override the value from the superclass