Unflag Group Configurations, Render only existing children in staff view of split_test.

lms/templates/split_test_author_view.html

@@ -5,7 +5,7 @@
 split_test = context.get('split_test')
 user_partition = split_test.descriptor.get_selected_partition()
 messages = split_test.descriptor.validation_messages()
-show_link = settings.FEATURES.get('ENABLE_GROUP_CONFIGURATIONS') and group_configuration_url is not None
+show_link = group_configuration_url is not None
 %>
 
 % if is_root and not is_configured:

lms/templates/split_test_staff_view.html

@@ -4,7 +4,7 @@
     <select class="split-test-select">
         % for idx, item in enumerate(items):
         ## Translators: The 'Group' here refers to the group of users that has been sorted into group_id
-        <option value="${item['group_id']}">${_("Group {group_id}").format(group_id=item['group_id'])}</option>
+        <option value="${item['group_id']}">${item['group_name']}</option>
         %endfor
     </select>