Use a linear interpolator for screen off, since the reveal effects already interpolate the reveal amount internally.

This was 'doubling up' interpolators causing unwanted timing effects, such as a seeming pause at the beginning.

Fixes: 191149706
Test: screen off begins faster
Change-Id: I92ad0cd5059b84a79069a4d3da37da1f92d03548

packages/SystemUI/src/com/android/systemui/statusbar/phone/UnlockedScreenOffAnimationController.kt

@@ -57,7 +57,7 @@ class UnlockedScreenOffAnimationController @Inject constructor(
 
     private val lightRevealAnimator = ValueAnimator.ofFloat(1f, 0f).apply {
         duration = LIGHT_REVEAL_ANIMATION_DURATION
-        interpolator = Interpolators.FAST_OUT_SLOW_IN_REVERSE
+        interpolator = Interpolators.LINEAR
         addUpdateListener { lightRevealScrim.revealAmount = it.animatedValue as Float }
         addListener(object : AnimatorListenerAdapter() {
             override fun onAnimationCancel(animation: Animator?) {