Merge "Give each preference screen its own activity and toolbar title" into sc-dev am: 8d6ca68786 am: a9a063294e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14709732

Change-Id: I768dc123e152f99411c1870148af2d0d89cc1376