Don't animate unlocked screen off if QS is expanded

Instead of determining whether to run the unlocked screen
off animation based on fullyCollapsed, check isExpanded which is
the expanded state onPanelExpansionChanged uses when
sending panel expansion updates to listeners.
This eventually updates
  DozeParameters#canControlScreenOff => and then checks
UnlockedScreenOffAnimationController#shouldPlayUnlockedScreenOffAnimation

Test: manually swipe down from home screen to
reveal QS, then press power button to AoD, no animation/jank
Fixes: 228786469

Change-Id: I0384e1300b6b50aaa8a119d11bf71186fb5379e8