Merge "Update drop target button alignment across devices." into tm-dev am: 8909fc2d

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



Change-Id: Id5e4de5aeca906c1bbd7ab63311e9399ded7f98b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>