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: NA
Change-Id: I05143d76c98de7bbcfdca5cfacb21b3ace669861