nixos/hyprland: set path order for systemd user services

[Reputable2772]

Description of changes

Change the Order of the PATH Environment Variable.

Fixes #320734

Things done

• Built on platform(s)
  • [x] x86_64-linux
  • [ ] aarch64-linux
  • [ ] x86_64-darwin
  • [ ] aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • [ ] sandbox = relaxed
  • [ ] sandbox = true
• [x] Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• [x] Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• [ ] Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • [ ] (Package updates) Added a release notes entry if the change is major or breaking
  • [ ] (Module updates) Added a release notes entry if the change is significant
  • [ ] (Module addition) Added a release notes entry if adding a new NixOS module
• [x] Fits CONTRIBUTING.md.

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[JohnRTitor]

Now that https://github.com/hyprwm/Hyprland/pull/6640 has been merged, we can remove this option, in the next 0.42 release.

Meanwhile there is services.xserver.updateDbusEnvironment, which has incomplete implementation (does not work on Hyprland). I plan to rework the option and make it like how Hyprland handles it using systemctl --import-environment and include the option to specify variables to import. https://github.com/NixOS/nixpkgs/blob/30a039c9ad420e669625680569cbbfdaed4116c8/nixos/modules/services/x11/display-managers/default.nix#L267

[JohnRTitor]

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