flatpak: Remove incorrect command from build

gnome-music was incorrectly setting 'command' in the module arguments.


(cherry picked from commit 8cc6f7cd)
3 jobs for cherry-pick-8cc6f7cd in 23 minutes and 48 seconds (queued for 3 minutes and 45 seconds)
Status Job ID Name Coverage
  Check
passed #7106
pep8

00:07:09

passed #7105
pyflakes

00:05:30

 
  Build
passed #7107
build

00:11:08