Avoid redundantly showing the local user in the PiP tile

If you are the only participant in the call, the expanded spotlight layout would redundantly show your media in both the spotlight and PiP tiles. This is a regression; in versions 0.16.1 and earlier we would avoid showing the same user twice.

src/state/CallViewModel/CallViewModel.ts

@@ -951,7 +951,7 @@ export function createCallViewModel$(
 
   const spotlightAndPip$ = scope.behavior<{
     spotlight: MediaViewModel[];
-    pip$: Behavior<UserMediaViewModel | undefined>;
+    pip$: Observable<UserMediaViewModel | undefined>;
   }>(
     ringingMedia$.pipe(
       switchMap((ringingMedia) => {
@@ -966,7 +966,10 @@ export function createCallViewModel$(
             return spotlightSpeaker$.pipe(
               map((speaker) => ({
                 spotlight: speaker ? [speaker] : [],
-                pip$: localUserMediaForPip$,
+                // Hide PiP if redundant (i.e. if local user is already in spotlight)
+                pip$: localUserMediaForPip$.pipe(
+                  map((m) => (m === speaker ? undefined : m)),
+                ),
               })),
             );
           }),