modules: add minimal variable to modules/default.nix

Fix regression caused by missing `minimal` variable in
modules/default.nix

Author: thomas-maurice

modules/default.nix

@@ -2,7 +2,7 @@
   configuration,
   pkgs,
   lib ? pkgs.lib,
-
+  minimal ? false,
   # Whether to check that each option has a matching declaration.
   check ? true,
   # Extra arguments passed to specialArgs.