Fix small gap between widget resize frame and widget background.

There is a 1dp gap on left/top/right/bottom between widget resize frame and widget background. Increasing the margin by 1dp will fill this gap.

Fix: 291104076
Test: See https://b.corp.google.com/issues/291104076#comment9
Flag: NONE
Change-Id: I471c27b8b5d59850a4bf342fc2d8fee50d6fd65d