fix AVPlayer unnecessary switching of threads in case current thread is already the main thread - this fixes also problem with disposing the video instance when AR scene is unmounted as it causes pause() to be called and somehow deadlocks threads

Author: Buthrakaur

android/sharedCode/src/main/java/com/viro/core/internal/AVPlayer.java

@@ -145,6 +145,10 @@ public interface PlayerAction<T> {
     }
 
     private <T> T runSynchronouslyOnMainThread(PlayerAction<T> action) throws ExecutionException, InterruptedException {
+        if (Looper.myLooper() == Looper.getMainLooper()) {
+            return action.performAction(mExoPlayer);
+        }
+
         Callable<T> callable = () -> action.performAction(mExoPlayer);
         FutureTask<T> future = new FutureTask<>(callable);