Only calling finishedwhen all the animations have finished

Previously we would finish way too early if any of the scrims
finished animation. Since some scrims almost never change, we
would have animations being terminated early.

Fixes: 141649119
Test: unlock with bypass, observe no lock icon change
Change-Id: I6aefd6a27ef315995d8e1ae62c27a5f33cc9e160