Merge "Reduce margin for DropTargetBar to avoid buttons to be truncated." into sc-dev am: eefccccb19 am: c1565463bd am: 2891944a4f

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

Change-Id: I4ef97ed229643d1ff43b75c728f6aed1f0901e32