refactor(nixos): inline module enable conditions

configs/nixos/modules/desktop/utilities/screenshot.nix

@@ -7,7 +7,6 @@
 # Keyboard-driven screenshots copy to the clipboard before Satty opens for
 # annotation. Satty copies annotated screenshots when it saves them.
 let
-  cfg = config.modules.desktop.utilities.screenshot; # NOLINT(let_order)
   user = config.user.name;
 
   grimblast = "${pkgs.grimblast}/bin/grimblast";
@@ -37,7 +36,7 @@ in
   options.modules.desktop.utilities.screenshot.enable =
     lib.mkEnableOption "screenshots via grimblast and satty";
 
-  config = lib.mkIf cfg.enable {
+  config = lib.mkIf config.modules.desktop.utilities.screenshot.enable {
     home-manager.users.${user} = {
       # satty is a one-shot annotation surface, so float it rather than letting
       # it claim a tile in the layout.