Add missing IntDef case in switch

PiperOrigin-RevId: 278332276

extensions/mediasession/src/main/java/com/google/android/exoplayer2/ext/mediasession/MediaSessionConnector.java

@@ -938,6 +938,7 @@ public final class MediaSessionConnector {
         return playWhenReady ? PlaybackStateCompat.STATE_PLAYING : PlaybackStateCompat.STATE_PAUSED;
         return playWhenReady ? PlaybackStateCompat.STATE_PLAYING : PlaybackStateCompat.STATE_PAUSED;
       case Player.STATE_ENDED:
       case Player.STATE_ENDED:
         return PlaybackStateCompat.STATE_STOPPED;
         return PlaybackStateCompat.STATE_STOPPED;
+      case Player.STATE_IDLE:
       default:
       default:
         return PlaybackStateCompat.STATE_NONE;
         return PlaybackStateCompat.STATE_NONE;
     }
     }