res_pjsip_transport_websocket: Add remote port to transport

When Asterisk receives a new websocket conenction, it creates a new
pjsip transport for it and copies connection data into it.  The
transport manager then uses the remote IP address and port on the
transport to create a monitor for each connection.  However, the
remote port wasn't being copied, only the IP address which meant
that the transport manager was creating only 1 monitoring entry for
all websocket connections from the same IP address. Therefore, if
one of those connections failed, it deleted the transport taking
all the the connections from that same IP address with it.

* We now copy the remote port into the created transport and the
  transport manager behaves correctly.

ASTERISK-30369

Change-Id: Ib506d40897ea6286455ac0be4dfbb0ed43b727e1