Play the correct track when inserting tracks into a sorted playlist

Play the correct track when inserting tracks into a sorted playlist

When Playlist::Controller::insertOptioned() is told to play the track
that has been inserted, it previously failed to account for the
relocation of the tracks when inserted into a sorted list.  The last
track in the list would end up being played, rather than the first
inserted track.

BUG: 244595
FIXED-IN: 2.6