Bug#944353: paraview - vtk depenency removed

[nkr at gmx.com]

Hi,

The issue described in this bug is fixed. However, after the update to
5.7.0-2, the new python3-paraview has no vtk dependencies (python3-
vtk7). Previously, paraview-python had dependencies on python-vtk6 and
python3-vtk7. Yet, `python -c "import vtk"` runs successfully even when
`dpkg -l | grep vtk`, shows no vtk packages. So I'm assuming, paraview
has parts of vtk packaged with it. Parts, because although `import vtk`
is successful, a script like the one in the link below fails.

https://vtk.org/Wiki/VTK/Examples/Python/Cylinder

It runs only after installing python3-vtk7. Perhaps this is
intentional. But I just wanted to make sure.

Thanks