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

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

Change-Id: Ie4a995b2fdfb197acce85ad5830d241ec4fc2770