Merge "Apply android:attr/dialogCornerRadius to widgets picker dialog top corners" into sc-dev am: 36f9aa7530 am: bcdf855e61

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14643392

Change-Id: I8a0eac4ac4bd9c173384ef09c06bbbab8c839cfa