[gnome-music] Non-fast-forward update to branch wip/jfelder/tracker-filter-audio-content-changed

[Jean Felder <jfelder src gnome org>]

The branch 'wip/jfelder/tracker-filter-audio-content-changed' was changed in a way that was not a 
fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  9b88e34... grltrackerwrapper: Filter content changed to keep only song

Commits added to the branch:

  7a0f1d2... grltrackerwrapper: Keep only songs and containers on conten