Revert "Show group email ids when mail is enabled"

This reverts commit cca9780f51.

The UI looks very cluttered with this

webadmin/src/views/users.html

@@ -355,7 +355,7 @@
                         <tbody>
                             <tr ng-repeat="group in groups | ignoreAdminGroup">
                                 <td class="text-overflow: ellipsis; white-space: nowrap;">
-                                    {{ group.name }}<span class="text-muted" ng-show="mailConfig.enabled">{{ '@' + config.fqdn }}</span>
+                                    {{ group.name }}
                                 </td>
                                 <td class="text-right" style="vertical-align: bottom">
                                     <button class="btn btn-xs btn-danger" ng-click="groupRemove.show(group)" title="Remove Group"><i class="fa fa-trash-o"></i></button>