Merge "Apply android:attr/dialogCornerRadius to widgets picker dialog top corners" into sc-dev am: 36f9aa7530 am: 9cc496cc6c am: a012c007d0

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

Change-Id: I67d81d58b0ef6923c40fa5a4bd39f5b0730ffbef