Merge "Fix rounded corners for shortcut & generated preview shadow box" into sc-dev am: bf60673bbb am: a3df3b8bf2 am: 2e797d5d5d

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

Change-Id: I295f403961841fb788e30dfab2f8932414432842