Do not store ec=session_expired if the client never subscribed

Summary: related to T13152

Reviewers: ivica

Reviewed By: ivica

Subscribers: miljen, iljazovic

Differential Revision: https://repo.mireo.local/D26803

example/websocket-tcp.cpp

@@ -168,5 +168,5 @@ void run_websocket_tcp_examples() {
 	publish_qos0_websocket_tcp();
 	publish_qos1_websocket_tcp();
 	publish_qos2_websocket_tcp();
-	subscribe_and_receive_websocket_tcp(2);
+	subscribe_and_receive_websocket_tcp(1);
 }