Only add charter state change link when chartering, it doesn't make

sense for an approved charter. Fixes ietf-tools#861.
 - Legacy-Id: 5799

Author: OleLaursen

ietf/templates/idrfc/document_charter.html

@@ -40,7 +40,7 @@
       <td>
         <div>
         <a title="{{ doc.get_state.desc }}"
-            {% if not snapshot and user|has_role:"Area Director,Secretariat" %} 
+            {% if not snapshot and chartering and user|has_role:"Area Director,Secretariat" %}
                class="editlink" href="{% url charter_change_state name=doc.name %}"
             {% endif %}>
             {{ doc.get_state.name }}