treewide: remove redundant rec

nixos/modules/services/misc/gitlab.nix

@@ -140,7 +140,7 @@ let
     RAILS_ENV = "production";
   };
 
-  gitlab-rake = pkgs.stdenv.mkDerivation rec {
+  gitlab-rake = pkgs.stdenv.mkDerivation {
     name = "gitlab-rake";
     buildInputs = [ pkgs.makeWrapper ];
     dontBuild = true;
@@ -155,7 +155,7 @@ let
      '';
   };
 
-  gitlab-rails = pkgs.stdenv.mkDerivation rec {
+  gitlab-rails = pkgs.stdenv.mkDerivation {
     name = "gitlab-rails";
     buildInputs = [ pkgs.makeWrapper ];
     dontBuild = true;

nixos/modules/services/misc/pykms.nix

@@ -9,7 +9,7 @@ in {
   meta.maintainers = with lib.maintainers; [ peterhoeg ];
 
   options = {
-    services.pykms = rec {
+    services.pykms = {
       enable = mkOption {
         type = types.bool;
         default = false;

nixos/modules/services/misc/zoneminder.nix

@@ -312,7 +312,7 @@ in {
     };
 
     systemd.services = {
-      zoneminder = with pkgs; rec {
+      zoneminder = with pkgs; {
         inherit (zoneminder.meta) description;
         documentation = [ "https://zoneminder.readthedocs.org/en/latest/" ];
         path = [