Remove double vertex addition when using precision=double for multimesh rendering #75788
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Fixes #75549
When in a multimesh pass on Vulkan and precision=double, the model_origin was being added to the vertex twice.
Applies to GPUParticles3D as well as MultiMeshInstance3D.
(Second animation was also using the billboard fix from #75462 but is not required for this fix to work).