VLCPlaybackService: Remove extra index computation
This merge request brings a fix to:
- The next media index computation that was unnecessarily executed for the
VLCMediaPlayerStateStoppingas it is already handled by theVLCMediaListPlayerclass.
It was causing an issue where the media selected was always skipped if the playback already started.
This issue only happens with libvlc 4 because the VLCMediaPlayerStateStopping state is not available on libvlc 3
Edited by Diogo Simao Marques