message_events: Refresh is-followed narrow on topic visibility update.

This adds live update support for `is-followed` narrow. We need
to render the narrow again instead of just adding the relevant
messages from the updated topic since it not easy to determine
which message we need to add based on the selected message of the
user and which messages to ask from the server.

web/src/server_events_dispatch.js

@@ -1009,7 +1009,10 @@ export function dispatch_normal_event(event) {
             break;
 
         case "user_topic":
-            user_topics_ui.handle_topic_updates(event);
+            user_topics_ui.handle_topic_updates(
+                event,
+                message_events.update_current_view_for_topic_visibility(),
+            );
             break;
     }
 }