Don't delay frame scheduling

Doing so will lead to state inconsistencies. setExpansionAffectsAlpha
won't enque opacity requrests because mUpdatePending won't be true yet,
causing sudden opacity changes.

The much longer mAnimationDelay will already take care of waiting for
a while before starting the scrim animation.

Test: manual, with fp sensor
Fixes: 158955776
Change-Id: I9f7342f01de36576ba0108edfecbfc97448c8756
(cherry picked from commit d38fed16)