fix references

platforms/nix-darwin/default.nix

@@ -3,5 +3,7 @@
   imports = lib.pipe (lib.filesystem.listFilesRecursive ./.) [
     # Get only files ending in .nix
     (builtins.filter (name: lib.hasSuffix ".nix" name))
+    # Remove this file
+    (builtins.filter (name: name != ./default.nix))
   ];
 }