nixos/safeeyes: add `safeeyes` to the global path

This will be needed for e.g. the settings dialog to work properly.

Changed files
+2
nixos
modules
services
+2
nixos/modules/services/misc/safeeyes.nix
···
config = mkIf cfg.enable {
+
environment.systemPackages = [ pkgs.safeeyes ];
+
systemd.user.services.safeeyes = {
description = "Safeeyes";