When a client tried to connect to an invalid port of an hidden service, a
warning was printed:

  [warn] connection_edge_process_relay_cell (at origin) failed.

This is because the connection subsystem wants to close the circuit because
the port can't be found and then returns a negative reason to achieve that.
However, that specific situation triggered a warning. This commit prevents it
for the specific case of an invalid hidden service port.

Fixes #16706

Signed-off-by: David Goulet <dgoulet@torproject.org>