Bug#952390: paraview: 3rd party plugins dir violates directory standards

[Drew Parsons]

Package: paraview
Version: 5.7.0-4+b2
Followup-For: Bug #952390
Control: forwarded -1 https://gitlab.kitware.com/paraview/paraview/issues/19714

Reported upstream at
https://gitlab.kitware.com/paraview/paraview/issues/19714