pqAboutDialog: avoid segfault when server has bad display
requested to merge utkarsh.ayachit/paraview:20891-pvserver-segfault-when-running-without-rendering-capabities into master
pqAboutDialog now doesn't attempt to check OpenGL information on a remote server if the server already reported that it doesn't support rendering.
Fixes #20891 (closed).
Closes #20891 (closed)