fix(visitors) remove default notification (#14970)

lang/main.json

         "labelTooltip": "Number of visitors: {{count}}",
         "notification": {
             "demoteDescription": "Sent here by {{actor}}, raise your hand to participate",
-            "description": "To participate raise your hand",
             "noMainParticipantsDescription": "A participant needs to start the meeting. Please try again in a bit.",
             "noMainParticipantsTitle": "This meeting hasn’t started yet.",
             "noVisitorLobby": "You cannot join while there is a lobby enabled for the meeting.",

react/features/visitors/middleware.ts

         const { conference } = action;
 
         if (getState()['features/visitors'].iAmVisitor) {
-            dispatch(openDialog(JoinMeetingDialog));
 
             const { demoteActorDisplayName } = getState()['features/visitors'];
 
-            dispatch(setVisitorDemoteActor(undefined));
-
-            const notificationParams: INotificationProps = {
-                titleKey: 'visitors.notification.title',
-                descriptionKey: 'visitors.notification.description'
-            };
-
             if (demoteActorDisplayName) {
-                notificationParams.descriptionKey = 'visitors.notification.demoteDescription';
-                notificationParams.descriptionArguments = {
-                    actor: demoteActorDisplayName
+                const notificationParams: INotificationProps = {
+                    titleKey: 'visitors.notification.title',
+                    descriptionKey: 'visitors.notification.demoteDescription',
+                    descriptionArguments: {
+                        actor: demoteActorDisplayName
+                    }
                 };
+
+                batch(() => {
+                    dispatch(showNotification(notificationParams, NOTIFICATION_TIMEOUT_TYPE.STICKY));
+                    dispatch(setVisitorDemoteActor(undefined));
+                });
+            } else {
+                dispatch(openDialog(JoinMeetingDialog));
             }
 
-            // check for demote actor and update notification
-            dispatch(showNotification(notificationParams, NOTIFICATION_TIMEOUT_TYPE.STICKY));
         } else {
             dispatch(setVisitorsSupported(conference.isVisitorsSupported()));
             conference.on(JitsiConferenceEvents.VISITORS_SUPPORTED_CHANGED, (value: boolean) => {