Disable unfold animation when animations disabled

When AnimatorScale is set to zero (possible from settings),
the fold animation is disabled.

The change to UnfoldLightRevealOverlayAnimation is needed
because the overlay view is added independently from
UnfoldTransitionProgressProvider callbacks every time the
internal screen is turned on.

Test: Tested on device &&
   atest com.android.systemui.unfold.util.ScaleAwareUnfoldProgressProviderTest
Bug: 208791440
Change-Id: Icda9ed6d708873768c4ac533b9c790ae1631b45c