mate.mate-settings-daemon: 1.20.0 -> 1.20.1

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

This update was made based on information from https://repology.org/metapackage/mate-settings-daemon/versions.

These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 1.20.1 with grep in /nix/store/n8ns53r2lfxa944hp7a8k9ylrwl18mp0-mate-settings-daemon-1.20.1
- directory tree listing: https://gist.github.com/de97ad2597f0b680b23b448f8353527b