Merge "Fix rounded corners for shortcut & generated preview shadow box" into sc-dev am: bf60673bbb am: bfd06c3260

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

Change-Id: Ic3ece6c1ec380f19d0ffb461bb405d22c6f1be1a