[wined3d] rename some NP2 fixup variables and update comments

[Tobias Jakobi]

This is mostly a patch for consistency. First of all I mixed terms a lot
in my code, sometimes using np2fixup - then again texrect_fixup and so on.

This patch cleans this up and calls everything NP2 fixup (since the code
isn't just doing RECT fixup, which is in fact a special case now).

Please apply this one after the newline patch. Thanks!

Greets,
Tobias
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