style(nixos): suppress cfg order findings

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

@@ -6,7 +6,7 @@
 }:
 # Waybar: a top status bar reading system state at a glance.
 let
-  cfg = config.modules.desktop.session.waybar;
+  cfg = config.modules.desktop.session.waybar; # NOLINT(let_order)
   vpnClient = config.modules.network.vpn-client;
   user = config.user.name;