Reset face isAuthenticated on keyguardDoneAnimationsFinished

Instead of onKeyguardGoingAway. We don't want the isUnlocked
state to be FALSE until all the keyguardDone animations are
finished.

Test: manually auth with face and then swipe up the bouncer.
Observe there aren't bouncer artifacts on the display.
Test: atest DeviceEntryFaceAuthRepositoryTest
Fixes: 314848760
Flag: NONE

Change-Id: I8b0c826653fb2a15765f7b3f5b7d1bb1be9f4416