vtkOpenGLBatchedPolyDataMapper: fix inconsistent rendering for composite

Lucas Givordrequested to merge
lucas.givord/vtk:fix-inconsistent-composite-rendering into master

Previously, the DrawIBO depends on the order of the VTKPolyDataToGLBatchElement map. As this map is ordered by the address of the dataset which change in a context of composite temporal data, it results of inconsistent rendering when playing an animation.

Now, the order depends on the flatIndex produced by the caller.

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