[WINED3D] Enable processing of shift modifiers ps 1.1-1.4

[Ivan Gyurdiev]

Shift modifiers are critical to things working correctly - they scale 
the output registers.

- enable the shift modifier code incorrectly disabled ("not needed") at 
the end of the shaders code.
- add a function to print out destination register modifiers - I hadn't 
noticed the importance of modifiers since the trace wasn't printing out 
any of them previously.

This has a visible effect on HL2. I think it's positive, although it's 
hard to tell, since the main problems remain. It seems to balance the 
color better for brighter output.





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