[mirotalksfu] - improve whiteboard if presenter

public/js/RoomClient.js

@@ -1089,6 +1089,11 @@ class RoomClient {
     // ####################################################
 
     async consume(producer_id, peer_name, peer_info) {
+        //
+        if (wbIsOpen && isPresenter) {
+            console.log('Update whiteboard canvas to the participants in the room');
+            wbCanvasToJson();
+        }
         this.getConsumeStream(producer_id).then(
             function ({ consumer, stream, kind }) {
                 console.log('CONSUMER', consumer);