Fix to use public form of the module variable
Fix to use public form of the module variable

Thanks to Utkarsh for spotting this. It would only work from inside VTK,
as VTK_MODULE_ prefixes are not defined in the "API" layer.

Change-Id: I660b8923023f54c700599eaf92afa4b4bcace881

berendkleinhaneveld/VTK,jmerkow/VTK,mspark93/VTK,demarle/VTK,ashray/VTK-EVM,candy7393/VTK,sankhesh/VTK,hendradarwin/VTK,demarle/VTK,sumedhasingla/VTK,collects/VTK,biddisco/VTK,aashish24/VTK-old,jmerkow/VTK,aashish24/VTK-old,msmolens/VTK,sumedhasingla/VTK,gram526/VTK,gram526/VTK,biddisco/VTK,mspark93/VTK,jmerkow/VTK,sankhesh/VTK,hendradarwin/VTK,collects/VTK,biddisco/VTK,msmolens/VTK,berendkleinhaneveld/VTK,keithroe/vtkoptix,msmolens/VTK,sankhesh/VTK,demarle/VTK,aashish24/VTK-old,msmolens/VTK,sumedhasingla/VTK,hendradarwin/VTK,keithroe/vtkoptix,aashish24/VTK-old,keithroe/vtkoptix,biddisco/VTK,mspark93/VTK,ashray/VTK-EVM,msmolens/VTK,jmerkow/VTK,gram526/VTK,johnkit/vtk-dev,SimVascular/VTK,gram526/VTK,SimVascular/VTK,aashish24/VTK-old,msmolens/VTK,keithroe/vtkoptix,demarle/VTK,jmerkow/VTK,SimVascular/VTK,SimVascular/VTK,candy7393/VTK,sumedhasingla/VTK,johnkit/vtk-dev,demarle/VTK,biddisco/VTK,keithroe/vtkoptix,mspark93/VTK,msmolens/VTK,ashray/VTK-EVM,SimVascular/VTK,SimVascular/VTK,ashray/VTK-EVM,johnkit/vtk-dev,jmerkow/VTK,sankhesh/VTK,hendradarwin/VTK,sankhesh/VTK,hendradarwin/VTK,mspark93/VTK,ashray/VTK-EVM,jmerkow/VTK,sumedhasingla/VTK,mspark93/VTK,jmerkow/VTK,candy7393/VTK,msmolens/VTK,keithroe/vtkoptix,collects/VTK,sankhesh/VTK,keithroe/vtkoptix,sankhesh/VTK,aashish24/VTK-old,candy7393/VTK,ashray/VTK-EVM,sumedhasingla/VTK,candy7393/VTK,ashray/VTK-EVM,SimVascular/VTK,mspark93/VTK,gram526/VTK,johnkit/vtk-dev,candy7393/VTK,sumedhasingla/VTK,keithroe/vtkoptix,collects/VTK,gram526/VTK,hendradarwin/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,berendkleinhaneveld/VTK,hendradarwin/VTK,candy7393/VTK,demarle/VTK,sumedhasingla/VTK,sankhesh/VTK,gram526/VTK,johnkit/vtk-dev,biddisco/VTK,gram526/VTK,demarle/VTK,mspark93/VTK,collects/VTK,biddisco/VTK,demarle/VTK,collects/VTK,berendkleinhaneveld/VTK,ashray/VTK-EVM,candy7393/VTK,berendkleinhaneveld/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,SimVascular/VTK