Merge "Remove the shadow under PendingAppWidgetHostView." into sc-v2-dev am: 0c1c0daa12 am: d41295fd77

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15328563

Change-Id: I811460ee7a2069e82a3b5d5ba84585851cbe213c