Don't show local media on top of itself

If you were the only one in the call, you could get a broken-looking view in which the local tile is shown in the spotlight, and it's also shown in the PiP. This is redundant.

src/state/CallViewModel.ts

@@ -488,13 +488,19 @@ export class CallViewModel extends ViewModel {
         ? ([of(screenShares.map((m) => m.vm)), this.spotlightSpeaker] as const)
         : ([
             this.spotlightSpeaker.pipe(map((speaker) => [speaker!])),
-            this.localUserMedia.pipe(
+            this.spotlightSpeaker.pipe(
+              switchMap((speaker) =>
+                speaker.local
+                  ? of(null)
+                  : this.localUserMedia.pipe(
                       switchMap((vm) =>
                         vm.alwaysShow.pipe(
                           map((alwaysShow) => (alwaysShow ? vm : null)),
                         ),
                       ),
                     ),
+              ),
+            ),
           ] as const),
     ),
   );