Fix for: mpd client starts with empty tracklist.
Fix for: mpd client starts with empty tracklist.

When restoring state, increment the tracklist version number.

kingosticks/mopidy,kingosticks/mopidy,jodal/mopidy,mopidy/mopidy,jcass77/mopidy,mopidy/mopidy,jcass77/mopidy,kingosticks/mopidy,jcass77/mopidy,jodal/mopidy,jodal/mopidy,adamcik/mopidy,adamcik/mopidy,mopidy/mopidy,adamcik/mopidy