lxqt.libfm-qt: 0.12.0 -> 0.13.1

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

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

These checks were done:

- built on NixOS

- 0 of 0 passed binary check by having a zero exit code.
- 0 of 0 passed binary check by having the new version present in output.
- found 0.13.1 with grep in /nix/store/j3k46ff4i767vxiajc1dy41fd5smdqid-libfm-qt-0.13.1
- directory tree listing: https://gist.github.com/f8d05638960a752c27ada529e3d8922e
- du listing: https://gist.github.com/9a3529479e5f3453a388a2bdadff58aa