Merge "Remove elevation from the full widgets picker container" into sc-dev am: 23cf59bfd5 am: e14cb20a6c

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14793490

Change-Id: Ie22b10b472747ae74881e0fecbdf9cd0bbe07dd9