Show workflow name on workflow history index page

wagtail/admin/templates/wagtailadmin/shared/workflow_history/list.html

@@ -28,7 +28,7 @@
                         </a>
                     </td>
                     <td>
-                        <h2>{{ workflow_name }}</h2>
+                        <h2>{{ workflow_state.workflow.name }}</h2>
                         {% trans 'Approved task' as approved_title %}
                         {% trans 'Incomplete task' as incomplete_title %}
                         {% for task in workflow_state.all_tasks_with_status %}