Merge "Update drop target button alignment across devices." into tm-dev am: 8909fc2dcb am: eef262002d

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

Change-Id: I2dd2f4496a9bf59604f314ac19746b4c434c211d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>