fix file dialog test recording.
requested to merge utkarsh.ayachit/paraview:18863-tools-recordtest-does-not-work-correctly-with-openfile-dialog into master
- remove obsolete PARAVIEW_DATA_DIR from vtkPVConfig.h. This is no longer available at compile time.
- simplify code in pqCoreTestUtility/pqFileDialogEventTranslator.
QDir::cleanPath
already standardizes path separators to be/
hence no need to usefromNativeSeparators
or explicitly replace\\
separators.
Closes #18863 (closed)