Merge "Center drop target button alignment across devices" into tm-dev am:...

Merge "Center drop target button alignment across devices" into tm-dev am: 179c289a am: 7ca1b38d am: 6329b20f

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/18580267



Change-Id: Id121a4eb31fda98107b3c622c907c105c288d0ef
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>