nixos/atop: fix mkSystemd

              wantedBy = [ (if type == "services" then "multi-user.target" else if type == "timers" then "timers.target" else null) ];

            };

          };

          mkService = lib.mkSystemd "services";

          mkTimer = lib.mkSystemd "timers";

          mkService = mkSystemd "services";

          mkTimer = mkSystemd "timers";

        in

        {

          packages = [ atop (lib.mkIf cfg.netatop.enable cfg.netatop.package) ];