Revert "nixosModules: fix namespacin"

This reverts commit b8671ca99f.

flake.nix

@@ -140,6 +140,9 @@
         ];
       };
 
-      nixosModules.e11sync = import ./modules/e11sync {};
+      nixosModules = rec {
+        e11sync = import ./modules/e11sync {};
+        nixosModules.default = e11sync;
+      };
     };
 }