Props: forward DrawModel's modelOrigin argument

DrawModel takes (this, results, info, boneToWorld, flexWeights,
flexDelayedWeights, const Vector &modelOrigin, flags). The hook dropped
modelOrigin, so flags landed in its slot and the real flags were read from
caller stack garbage. studiorender.so 0x83ad0 reads 0x20(%ebp) as the
modelOrigin pointer and 0x24(%ebp) as the flags; passing both restores the
engine's normal draw.

This is the cause of the intermittent (~50%) checkerboard/error-material
props: the draw was being issued with a garbage flag word.

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