Description of problem: 
With the latest update, the Fedora flatpak version of gnome music fails to start at all.


Version-Release number of selected component (if applicable):
Gnome music commit 2020-12-17 19:16:31



How reproducible:
Every time

Steps to Reproduce:
1. flatpak run org.gnome.Music

Actual results:
The program crashes at startup with the following backtrace:

Traceback (most recent call last):
  File "/app/bin/gnome-music", line 132, in <module>
    sys.exit(main())
  File "/app/bin/gnome-music", line 127, in main
    return run_application()
  File "/app/bin/gnome-music", line 113, in run_application
    from gnomemusic.application import Application
  File "/app/lib/python3.9/site-packages/gnomemusic/application.py", line 37, in <module>
    from gnomemusic.coregrilo import CoreGrilo
  File "/app/lib/python3.9/site-packages/gnomemusic/coregrilo.py", line 32, in <module>
    from gnomemusic.grilowrappers.grltrackerwrapper import GrlTrackerWrapper
  File "/app/lib/python3.9/site-packages/gnomemusic/grilowrappers/grltrackerwrapper.py", line 33, in <module>
    from gnomemusic.grilowrappers.grltrackerplaylists import GrlTrackerPlaylists
ModuleNotFoundError: No module named 'gnomemusic.grilowrappers.grltrackerplaylists'



Expected results:
The program should start.


Additional info: 
Fedora Silverblue 33 host