Hide bubbles when the status bar window is hidden

This fixes a regression that was introduced sometime between ag/16631031 and ag/16631031.
Bubbles visibility at some point stopped accounting for the state of the status bar window.

Fixes: 299744258
Test: atest CentralSurfacesImpl
Test: - Take a screen record
     - Create a bubble
     - Launch Photos and and play the video
       - If the video doesn't play in full screen, go to full screen
     - Observe that bubbles disappear
     - Exit full screen
     - Observe that bubble re-appear
Change-Id: I68d7c391dcbb9606a98452e82d86d6a8f3e5028d