[mirotalksfu] - add delete sound

public/js/Room.js

@@ -1443,6 +1443,7 @@ function confirmClearBoard() {
     }).then((result) => {
         if (result.isConfirmed) {
             whiteboardAction(getWhiteboardAction('clear'));
+            sound('delete');
         }
     });
 }

public/js/RoomClient.js

@@ -1799,6 +1799,7 @@ class RoomClient {
                     msgs = chatMsger.firstChild;
                 }
                 this.chatMessages = [];
+                this.sound('delete');
             }
         });
     }