lxqt.obconf-qt: 0.12.0 -> 0.13.0

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/obconf-qt/versions.

These checks were done:

- built on NixOS
- Warning: no invocation of /nix/store/8sixxrkxdsqd1x37m32jlraa3193ahl6-obconf-qt-0.13.0/bin/obconf-qt had a zero exit code or showed the expected version
- 0 of 1 passed binary check by having a zero exit code.
- 0 of 1 passed binary check by having the new version present in output.
- found 0.13.0 with grep in /nix/store/8sixxrkxdsqd1x37m32jlraa3193ahl6-obconf-qt-0.13.0
- directory tree listing: https://gist.github.com/db1190dab0d515449974bf0da5486e41
- du listing: https://gist.github.com/8ad4a03d3203c3dd52b7172d3e5432d6