Use correct variable to determine Python version.

Utkarsh Ayachitrequested to merge
utkarsh.ayachit/vtk:fix-python-install-rules into master

The install rules looked at VTK_PYTHON_VERSION to determine Python install rules instead of using the version number from Python interp that was found. That was causing issues in build where the VTK_PYTHON_VERSION was not set correctly. Fixed that.

Addresses paraview/paraview#18011 (closed)

Backport: paraview/release

Edited by Ben Boeckel

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