Unable to open Query tool on Internet Explorer.

Remove extra comma in the function argument while starting the query tool.
Other browsers had no problems, but it is an issue on Internet explorer.

Fixes #4769

web/pgadmin/tools/datagrid/templates/datagrid/index.html

@@ -440,7 +440,7 @@
     sqlEditorController.start(
         {{ uniqueId }},
         {{ url_params|safe}},
-        '{{ layout|safe }}',
+        '{{ layout|safe }}'
     );
 });
 {% endblock %}