Merge "Fix rounded corners for shortcut & generated preview shadow box" into sc-dev am: bf60673bbb am: bfd06c3260 am: cb92dd2381

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

Change-Id: Ie0e317d3cbcb11c28721d366f1d02b2e732d9724