Merge "Fix rounded corners for shortcut & generated preview shadow box" into sc-dev am: bf60673bbb am: a3df3b8bf2

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15098570

Change-Id: Ifb9f1a1380148b655dfa8f45d78f6045d8264cc6