python39Packages.django-versatileimagefield: remove unused input, add import check

pkgs/development/python-modules/django-versatileimagefield/default.nix

@@ -2,7 +2,6 @@
 , buildPythonPackage
 , fetchPypi
 , django
-, python
 , pillow
 , python_magic
 }:
@@ -22,6 +21,8 @@ buildPythonPackage rec {
   # tests not included with pypi release
   doCheck = false;
 
+  pythonImportsCheck = [ "versatileimagefield" ];
+
   meta = with lib; {
     description = "Replaces django's ImageField with a more flexible interface";
     homepage = "https://github.com/respondcreate/django-versatileimagefield/";