Anchoring bottom of notifications scrim in split shade mode

This is effectively changing animation of the notification scrim
from expansion to fade in.

Test: manual
Bug: 185110525

Change-Id: If57866c004bb781294a860bb1dc66174c87becdc

packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelViewController.java

@@ -2006,7 +2006,7 @@ public class NotificationPanelViewController extends PanelViewController {
                 right = getView().getRight();
             } else {
                 top = Math.min(qsPanelBottomY, mSplitShadeNotificationsTopPadding);
-                bottom = getExpandedHeight() - mSplitShadeNotificationsTopPadding;
+                bottom = mNotificationStackScrollLayoutController.getHeight();
                 left = mNotificationStackScrollLayoutController.getLeft();
                 right = mNotificationStackScrollLayoutController.getRight();
             }