Update with_classes parameter

I only updated the parameters mentioned by Martin on his request.

There are many other outdated parameters:

• class_id
• classification_confidence
• classification_confidence_operator
• classification_high_confidence
• metadata_name
• metadata_operator
• metadata_value
• mirrored
• order
• order_direction
• page
• page_size
• rotation_angle

I think it would be smarter to use our API schema here, as we have all the required details for the validation.
It would be more consistent too (checking that IDs really are IDs and not strings)

arkindex_worker/worker/element.py

@@ -188,12 +188,11 @@ class ElementMixin(object):
     def list_element_children(
         self,
         element,
-        best_class=None,
         folder=None,
         name=None,
         recursive=None,
         type=None,
-        with_best_classes=None,
+        with_classes=None,
         with_corpus=None,
         with_has_children=None,
         with_zone=None,
@@ -206,11 +205,6 @@ class ElementMixin(object):
             element, (Element, CachedElement)
         ), "element shouldn't be null and should be an Element or CachedElement"
         query_params = {}
-        if best_class is not None:
-            assert isinstance(best_class, str) or isinstance(
-                best_class, bool
-            ), "best_class should be of type str or bool"
-            query_params["best_class"] = best_class
         if folder is not None:
             assert isinstance(folder, bool), "folder should be of type bool"
             query_params["folder"] = folder
@@ -223,11 +217,9 @@ class ElementMixin(object):
         if type:
             assert isinstance(type, str), "type should be of type str"
             query_params["type"] = type
-        if with_best_classes is not None:
-            assert isinstance(
-                with_best_classes, bool
-            ), "with_best_classes should be of type bool"
-            query_params["with_best_classes"] = with_best_classes
+        if with_classes is not None:
+            assert isinstance(with_classes, bool), "with_classes should be of type bool"
+            query_params["with_classes"] = with_classes
         if with_corpus is not None:
             assert isinstance(with_corpus, bool), "with_corpus should be of type bool"
             query_params["with_corpus"] = with_corpus