Fix playback not working after player enters idle state

On some phones (e.g. Oppo and Oneplus) the video player enters the STATE_IDLE 10 minutes after being paused. This causes the play button to stop working.

This happens because once a player has become idle, we need to call prepare() before playback can happen again.

But after I added prepare(), it would just skip to the end of the video. So now I'm executing the same code that happens when ERROR_CODE_UNSPECIFIED is done. This causes playback to resume normally.

app/src/main/java/org/schabi/newpipe/player/Player.java

@@ -1752,6 +1752,13 @@ public final class Player implements PlaybackListener, Listener {
             }
         }
 
+        if (isStopped()) {
+            // Some phones suspend a paused player after 10 minutes. This causes the player to
+            // enter STATE_IDLE, causing playback to fail. So we try to recover from that here.
+            setRecovery();
+            reloadPlayQueueManager();
+        }
+
         simpleExoPlayer.play();
         saveStreamProgressState();
     }