dx9: Correct off-by-one to the right on tex upload.

As seen in tests.  But I'm pretty sure we're still off.
Assert state on first frame.

This won't matter much for games, but makes tests run more sanely.
dx9: Only use anisotropic when filter was linear.
Merge pull request #7243 from unknownbrackets/gpu-minor

dx9: Correct horizontal off by one, test results, and aniso