GUACAMOLE-723: Move getClientIdentifier() to GroupListItem for convenience of other uses of the guacGroupList directive.

guacamole/src/main/webapp/app/home/templates/connection.html

@@ -1,5 +1,5 @@
 <a class="home-connection"
-   ng-href="#/client/{{context.getClientIdentifier(item)}}"
+   ng-href="#/client/{{ item.getClientIdentifier() }}"
    ng-class="{active: item.getActiveConnections()}">
 
     <!-- Connection icon -->

guacamole/src/main/webapp/app/home/templates/connectionGroup.html

@@ -1,4 +1,4 @@
 <span class="home-connection-group name">
-    <a ng-show="item.balancing" ng-href="#/client/{{context.getClientIdentifier(item)}}">{{item.name}}</a>
+    <a ng-show="item.balancing" ng-href="#/client/{{ getClientIdentifier() }}">{{item.name}}</a>
     <span ng-show="!item.balancing">{{item.name}}</span>
 </span>

guacamole/src/main/webapp/app/home/templates/home.html

@@ -23,7 +23,6 @@
         </div>
         <div class="all-connections">
             <guac-group-list
-                context="context"
                 connection-groups="filteredRootConnectionGroups"
                 templates="{
                     'connection'       : 'app/home/templates/connection.html',