[PATCH] d3dx9: Correctly round constants in D3DXSHMultiply3 implementation

[Matteo Bruni]

Signed-off-by: Matteo Bruni <mbruni at codeweavers.com>
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I missed the multiple close-but-not-quite-identical constants in the
paper. I'm not sure that they should actually differ but I don't feel
like recomputing those coefficients AND it might well be that using
more accurate coefficients would "break" our implementation by making
it generate different results compared to native. So yeah, let's take
your patch as-is.