Merge "Remove the shadow under PendingAppWidgetHostView." into sc-dev am: 0a70a5a690 am: 036404d1fe

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15328564

Change-Id: I8943b6c5cbb1774191194eb1e69fc781c5288a42