message: transport: fix MTU blackhole detection
diff: @@ -793,14 +793,14 @@ impl Manager {
  is_mtu_probe,
  });
  - if is_mtu_probe {
  + // Notify the MTU controller of packet loss even if it wasn't a probe since it uses
  + // that information for blackhole detection.
  path.mtu_controller.on_packet_loss(
  packet_number,
  sent_info.sent_bytes,
  now,
  &mut path.congestion_controller,
  );
  - }
  if persistent_congestion {
  //= https://tools.ietf.org/id/draft-ietf-quic-recovery-32.txt#5.2
  