made the chat audio cue usable by all users

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

@@ -64,7 +64,8 @@ with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
                 } else {
                     LOGGER.debug("fontSize in config.xml not found: {0}", [chatOptions.fontSize]);
                 }
-                chatNoiseCheckBox.visible = Accessibility.active;
+                chatNoiseCheckBox.selected = Accessibility.active;
+                changeChatNoise();
             }
             
             public function accessibleClick(event:KeyboardEvent):void{
@@ -140,5 +141,5 @@ with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
                      selectedIndex="1" toolTip="{ResourceUtil.getInstance().getString('bbb.chat.cmbFontSize.toolTip')}" />
     </mx:HBox>
 	<mx:CheckBox id="chatNoiseCheckBox"  label="Audible Chat Notification" labelPlacement="left" 
-				 selected="true" change="changeChatNoise()" styleName="chatOptionsLabel" />
+				 change="changeChatNoise()" styleName="chatOptionsLabel" />
 </mx:VBox>

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

@@ -71,7 +71,7 @@ with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
 		  private var publicWaiting:Boolean = false;
 		  private var publicFocus:Boolean = false;
 		  private var noticeLabel:String;
-		  private var chatNoiseEnabled:Boolean = true;
+		  private var chatNoiseEnabled:Boolean = false;
 			
 		  [Embed(source="../sounds/notice.mp3")] 
 		  private var noticeSoundClass:Class;
@@ -309,7 +309,7 @@ with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
 			}
 			
 			private function playSound():void {
-				if (Accessibility.active && chatNoiseEnabled){
+				if (chatNoiseEnabled){
 					noticeSound.play();
 				}
 			}