message: Fix connection.rs
diff: @@ -233,12 +233,7 @@ impl<T: Http3Transaction> Http3Connection<T> {
  ) -> Res<HandleReadableOutput> {
  qtrace!([self], "Readable stream {}.", stream_id);
  - let label = if ::neqo_common::log_enabled!(::log::Level::Debug) {
  - format!("{}", self)
  - } else {
  - String::new()
  - };
  -
  + let label = ::neqo_common::log_subject!(::log::Level::Debug, self);
  if self.handle_read_stream(conn, stream_id)? {
  qdebug!([label], "Request/response stream {} read.", stream_id);
  Ok(HandleReadableOutput::NoOutput)
  