d3d9: tests/visual.c: another wee bit of slop

[Dan Kegel]

Somehow I didn't notice it before, but if you look carefully
at the patch and example failures I posted before,
it's obvious that the previous patch only fixed half of the
claimed errors.  This increases the slop from 1 to 2 and fixes the other half:

visual.c:6491: Test failed: GOURAUD shading has color0 000fc927,
expected 0x00dca28
visual.c:6503: Test failed: PHONG shading has color0 000fc927,
expected 0x000dca28
visual.c:6491: Test failed: GOURAUD shading has color0 000fc927,
expected 0x00dca28
visual.c:6503: Test failed: PHONG shading has color0 000fc927,
expected 0x000dca28
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