Merge "Reset fast scroller when All Apps resets." into tm-qpr-dev am: 5969e0524a am: 199eb1f5b3 am: ecb787f562 am: 6f95a8e581

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/21406904

Change-Id: I8a09af2f1c391c3f67e7b46864e367ebd32b94c3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>