Use the room_display_name when presenting on the home page, and not the...

Use the room_display_name when presenting on the home page, and not the room_alias which may not be set.

webclient/home/home.html

@@ -26,7 +26,7 @@
     
     <div class="public_rooms" ng-repeat="room in public_rooms">
         <div>
-            <a href="#/room/{{ room.room_alias ? room.room_alias : room.room_id }}" >{{ room.room_alias }}</a>
+            <a href="#/room/{{ room.room_alias ? room.room_alias : room.room_id }}" >{{ room.room_display_name }}</a>
         </div>
     </div>
     <br/>