test different flakeModules definition

modules/flake-parts.nix

@@ -4,6 +4,6 @@
   ];
 
   flake.flakeModules = {
-    docs-entry-point = inputs.import-tree.filterNot (inputs.nixpkgs.lib.hasInfix "flake-parts") "${self}/modules";
+    docs-entry-point = inputs.import-tree "${self}/modules";
   };
 }