[WINED3D] Use correct register number mask [ affects 2.0+ shaders ]

[Ivan Gyurdiev]

The regmask currently being used is wrong - 0x1FFF includes the high two 
bits of the register type.
This is bad, because those bits are not 0 in 2.0+ shaders, causing major 
problems.
The correct mask is the one in the d3d8/9 header - 0x7FF.

Applies after shift_modifers/arb_version patches.
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