Action on application switching picture-in-picture mode bug

When "play videos in Picture-in-picture mode" is selected try to open the subtitle picker it will go to pop-up mode. https://code.videolan.org/videolan/vlc-android/blob/1ce967626f73fbfd09ba144829b906a7ac512038/vlc-android/src/org/videolan/vlc/gui/video/VideoPlayerActivity.java#L595