Fix incorrect RemoveFile method

[DeadlyEmbrace]

• The Playlist RemoveFile method stops media playback if the last item in the playlist is removed. This should not occur, playback should instead stop if the removed item is the currently playing file from the playlist (this logic is invoked by the RemoteControl extension, not the playlist itself)

[Garteal]

The idea behind that was to support a feature request which removes the file after playback has completed, and for some reason I decided to put it there. I didn't know the RemoteControl extension used the same function. In that case your change is definitely the right one. I'll merge it and make a fix for the aforementioned feature later.

Thanks for the fix!