Shorter scrim delay if display is on

Reduces the scrim blanking delay in cases where the display
was already on:
- AOD enabled and display doesn't require blanking.
- Pulsing notification since we're already in a high power state.

Test: unlock with fp
Test: double tap pulsing notification
Test: unlock with fp when pulsing
Test: unlock with pin
Change-Id: I5aa98d7affc92119af6f8777462460a2b05e1374
Fixes: 73187454