Fix flickering when receiving notification

It was possible to see the full shade background for 1
frame when a notification arrives.

Test: receive HUN on AOD, swipe to shade
Fixes: 129691628
Change-Id: Ib24916fcee2de2800d23f082397e2fffc7c81354

packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayout.java

@@ -399,7 +399,7 @@ public class NotificationStackScrollLayout extends ViewGroup implements ScrollAd
     private final ViewOutlineProvider mOutlineProvider = new ViewOutlineProvider() {
         @Override
         public void getOutline(View view, Outline outline) {
-            if (mAmbientState.isDarkAtAll() && !mAmbientState.isFullyDark() || !mShowDarkShelf) {
+            if (mAmbientState.isDarkAtAll() || !mShowDarkShelf) {
                 outline.setRoundRect(mBackgroundAnimationRect, mCornerRadius);
             } else {
                 ViewOutlineProvider.BACKGROUND.getOutline(view, outline);