Lost instrumentation for ingress connections

 (Prometheus) Instrumentation got lost since 0.5.36 for ingress connection, in particular:
- `wormhole_net_listener_conn_accepted_total`
- `wormhole_net_listener_conn_closed_total`
- `wormhole_net_conn_duration_seconds`
- `wormhole_net_conn_rcvd_bytes`
- `wormhole_net_conn_rcvd_bytes`