Don't animate when state is immediate

Avoid extending animation for states that are
immediate. Also cleaning up a little bit and
avoiding unecessary repaint.

Change-Id: I1644ce0b539cf92083b47cf3587b01f92b239095
Test: atest packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/ScrimControllerTest.java
Test: brightness mirror
Test: receive notification on keyguard while dragging
Test: unlock with fp
Fixes: 73784491