Never drain a closing socket from unsubscribeAll

src/WebSocketContext.h

@@ -249,7 +249,7 @@ private:
                 }
 
                 /* Make sure to unsubscribe from any pub/sub node at exit */
-                webSocketContextData->topicTree.unsubscribeAll(webSocketData->subscriber);
+                webSocketContextData->topicTree.unsubscribeAll(webSocketData->subscriber, false);
                 delete webSocketData->subscriber;
                 webSocketData->subscriber = nullptr;
             }