Added Panel animation when media disappears from the expanded qs

Previously there was no animation. This is not perfect yet,
but we at least animate the quick settings. Animating the
carousel will require significantly more work and will be
tackled in a later release.

Fixes: 158445487
Test: add media, kill in when expanded
Change-Id: I537d366e2ec18c4eb082a1ac848890a57d7f1a04