nixos: always run home-manager on NixOS activation

[Enzime]

Description

Currently, the home-manager systemd service will only get restarted when the home-manager configuration changes. This can lead to issues in users' home directories not getting corrected for a while.

$ rm ~/.zshrc
$ sudo nixos-rebuild switch
$ ls ~/.zshrc
ls: cannot access '/home/enzime/.zshrc': No such file or directory

Checklist

• Change is backwards compatible.

• Code formatted with ./format.

• Code tested through nix-shell --pure tests -A run.all or nix develop --ignore-environment .#all using Flakes.

• Test cases updated/added. See example.

• Commit messages are formatted like

  {component}: {description}
  
  {long description}
  

  See CONTRIBUTING for more information and recent commit messages for examples.

• If this PR adds a new module

  • Added myself as module maintainer. See example.

Maintainer CC

cc @rycee

[Enzime]

cc @rycee