Return when playing external media

I made the experience with both filemanagers I use (OI FileManager and the cyanogenmod filemanager app), that AntennaPod (and other apps) don't disconnect and return to the filemanager.

What I mean is this: open mp3 file in the filemanager -> launches AudioPlayerActivity, switch back to homescreen (music is playing in the background), launch filemanager -> I land in the AudioPlayerActivity, while for me the expected behaviour upon launching the filemanager would be to end up in the filemanager activity.

This change remedies the issue. I am not sure if there might be any unintended side-effects, I haven't observed any upon testing though.