wined3d: Properly round negative values in shader_glsl_mov

[Chris Robinson]

This fixes bug 7203, which was caused by a patch to add rounding to the 
aforementioned function but improperly rounded negative values. This properly 
handles rounding for both positive and negative values.

I'm not sure if this is the optimal method of rounding in GLSL, but its the 
only thing I can think of that works.
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