lxqt.pcmanfm-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/pcmanfm-qt/versions.

Version release notes (from GitHub):

These checks were done:

- built on NixOS
- Warning: no invocation of /nix/store/bk3zw1jxkfyyl07iy97ag6vsq6vgqk9i-pcmanfm-qt-0.13.0/bin/pcmanfm-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/bk3zw1jxkfyyl07iy97ag6vsq6vgqk9i-pcmanfm-qt-0.13.0
- directory tree listing: https://gist.github.com/960359b159f85d99f590576d9d63b63f
- du listing: https://gist.github.com/e90b52e16cdb6fdfa96bca76047129b4