Update SurfaceControlViewHostTests corner tap offset

Tapping on 0,0 is considered outside theview bounds, this CL adds a
small offset of 1 px for it to be inside the window bounds.

Test: atest SurfaceControlViewHostTests
Bug: 371867486
Flag: TEST_ONLY
Change-Id: I62d3bf33169f8735bbb46f742b35becbb07965f5