Fix bouncer flicker on lockscreen shade transition

Both CentralSurfacesImpl and StatusBarKeyguardViewManager are
attempting to control bouncer visibility on shade collapse, leading to
potential conflict. Let StatusBarKeyguardViewManager handle this
scenario.

Fixes: 232948170
Test: From home, power off, power on, swipe down to see notifs, swipe up
Change-Id: I1a1ad69b71887052eb208d6d6c1f3b7783a1834a