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

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

Change-Id: I6e1d10c7dbac9e8e062badad6b68e63dd709bd3e