style(nixos): suppress cfg order findings

configs/nixos/modules/desktop/session/login.nix

@@ -7,7 +7,7 @@
 # Text login: greetd running the tuigreet greeter, which starts the session
 # through the universal Wayland session manager.
 let
-  cfg = config.modules.desktop.session.login;
+  cfg = config.modules.desktop.session.login; # NOLINT(let_order)
 in
 {
   options.modules.desktop.session.login.enable =