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

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

Change-Id: Iecc95592f1bba5833f18e9c3e005b0c15bc8981e