fix: Reset MSE when we disconnect from Remote Playback (#7506)

Author: avelad

lib/player.js

@@ -2439,7 +2439,13 @@ shaka.Player = class extends shaka.util.FakeEventTarget {
       this.loadEventManager_.listen(mediaElement.remote, 'connecting',
           () => this.onTracksChanged_());
       this.loadEventManager_.listen(mediaElement.remote, 'disconnect',
-          () => this.onTracksChanged_());
+          async () => {
+            if (this.streamingEngine_ &&
+                mediaElement.remote.state == 'disconnected') {
+              await this.streamingEngine_.resetMediaSource();
+            }
+            this.onTracksChanged_();
+          });
     }
     if (mediaElement.audioTracks) {
       this.loadEventManager_.listen(mediaElement.audioTracks, 'addtrack',