Remove cut&paste error

problems/templates/problems/alarms.html

@@ -62,7 +62,7 @@
           <td>{{alarm.host.hostname}}</td>
           <td>{{alarm.description}}</td>
           <td>{{alarm.timestamp|date:"d/m/Y H:i:s"}}</td>
-          <td>{% if alarm.ack_by.user.get_full_name %}{{ alarm.ack_by.user.get_full_name }}{% else %}{{ alarm.ack_by }}{% endif %}</td>
+          <td>{% if alarm.ack_by.user.get_full_name %}{{ alarm.ack_by.get_full_name }}{% else %}{{ alarm.ack_by }}{% endif %}</td>
           <td>{{alarm.ack_when|date:"g/m/Y H:i:s"}}</td>
         </tr>
         {% endfor %}