message: Fix republish test
diff: @@ -1542,7 +1542,7 @@ mod jetstream {
  while let Some((i, message)) = messages.next().await {
  let message = message.unwrap();
  - assert_eq!(format!("source.{}", i), message.subject);
  + assert_eq!(format!("dest.source.{}", i), message.subject);
  assert_eq!(i.to_string(), from_utf8(&message.payload).unwrap());
  message.ack().await.unwrap();
  }
  