fix bug with private chat opening key press detection

bigbluebutton-client/src/org/bigbluebutton/modules/chat/views/AddChatTabBox.mxml

@@ -75,7 +75,7 @@ with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
                 lockSettingsChanged();
             }
             
-            public function accessibleClick(event:KeyboardEvent):void{
+            public function onUserListKeyDown(event:KeyboardEvent):void{
                 if (event.keyCode == 32){
                     openPrivateChat(event);
                 }
@@ -148,7 +148,8 @@ with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
              visible="{chatOptions.privateEnabled}" includeInLayout="{chatOptions.privateEnabled}"
              itemRenderer="org.bigbluebutton.modules.chat.views.UserRenderer"
              labelField="name"
-             itemClick="openPrivateChat(event)" 
+             itemClick="openPrivateChat(event)"
+             keyDown="onUserListKeyDown(event)"
              toolTip="{ResourceUtil.getInstance().getString('bbb.chat.usersList.toolTip')}"
              accessibilityName="{ResourceUtil.getInstance().getString('bbb.chat.usersList.accessibilityName')}"/>
     <mx:Label styleName="chatOptionsLabel" text="{ResourceUtil.getInstance().getString('bbb.chat.chatOptions')}" />

bigbluebutton-client/src/org/bigbluebutton/modules/chat/views/ChatView.mxml

@@ -294,7 +294,6 @@ with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
 				tabBox.name = OPTION_TAB_ID;
 				tabBox.chatOptions = chatOptions;
 				tabBox.tabIndexer.startIndex = tabIndexer.startIndex + 10;
-				tabBox.addEventListener(KeyboardEvent.KEY_DOWN, tabBox.accessibleClick);
 				chatTabs.addChild(tabBox);
 				
 				return tabBox;