Gradients doesn't work trough VrayMultiSubTex with IDs other than 1

[Mnietek2707]

As in the title
V-Ray 5 update 2.3

This apply to Gradient Map, Gradient Ramp, Bercon Gradient

[hermit.crab]

We are aware of the issue (internal bug-tracker id: VGPU-3179). I'll bump its priority additionally. Baking the gradient maps seems to be the only workaround.