Don't capture border for SurfaceControlTest

Offset the pixels to check by 1 pixel around the border since some
chips change the texture at the edges.

Test: SurfaceControlTest
Fixes: 203672571
Change-Id: Ib0176bffdc2f4e1d5ed428d60ee727d5248750c6
(cherry picked from commit a689c35464d8b68788fff865b025a9a00e90a227)