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Skip color texture in multitexturing

Lucas Gandel requested to merge LucasGandelKitware/vtk:fix-colortexture-multiple-sampling into master

6da590df added support for using textures with interpolate scalars. However, the color texture used for scalar coloring was wrongly taken into account for multitexturing, because the scalar color is already in gl_FragData[0].

Fix this by excluding the color texture based on its name. We must update the check to identify the first texture, because the color texture was index 0.

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