MINOR: server: Don't set the check port during the update from a state file

MINOR: server: Don't set the check port during the update from a state file

When the server state is loaded from a server-state file, there is no reason
to set an unconfigured check port with the server port. Because by default,
if the check port is not set, the server's one is used. Thus we can remove
this useless assignment. It is mandatory for next improvements.