Merge "Update scrim in widget pickers." into sc-dev am: c599c90eaa am: 2882bf5180 am: 435fe175e6

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14776603

Change-Id: I4f3b51ac54b1f6d1ff8b114dddb9bb05afb9c9eb