Merge "Update drop target button alignment across devices." into tm-dev am: 8909fc2dcb

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/17940799

Change-Id: I4587f9a792a9e54cc369e4c483740bae71c8a070
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>