Merge "Reduce margin for DropTargetBar to avoid buttons to be truncated." into sc-dev am: eefccccb19 am: f03b1aeeb6 am: f273be1019

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15155531

Change-Id: Ife4e91f79708eff4cdf5f5628a9809db1fc1eef2