Fixes an issue where the media players would animate on screen off

Because qs collapses when we start dozing, we triggered an animation
that looked janky. We now instead don't reattach them at all
and block the animation.

Test: atest SystemUItests
Bug: 154137987
Change-Id: I75a386d7f1dfb65c040d42b8d7aeaf34314b5d10