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CellGrid: Add missing PositionVC implementation in fragment shader

Jaswant Panchumarti (Kitware) requested to merge jaswant.panchumarti/vtk:fix-vertexVC-missing-shader-error into master

This commit db39a4f1 changed GLSLModLight to use vertexVC instead of vertexPositionVC. However, the cell grid fragment shader did not even have the right templated line for that replacement to occur. Hence, in paraview, where light kit is enabled, the shader failed to compile.

backport: paraview/release

Edited by Jaswant Panchumarti (Kitware)

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