Fixed the performance of unlocking when dozing

When unlocking from pulsing, we would go to the keyguard
in the middle of the animation. We're now delaying that
update until the reveal animation has finished to hide
the giant jank of leaving the lockscreen.

Test: atest SystemUITests
Bug: 197113783
Change-Id: Iebefca3a1810a498654cad0e461532a5d9f7d0af