Fix bug reported by KenDB3:

The JS-modeled user object's ip_address and host_name property values did not
reflect the current connection during logon events (JS modules executed during
logon, e.g. logon.js). Moved the initialization of the current user
(sbbs_t::useron) ipaddr and comp field to sbbs_t::logon() rather than when
control returns to sbbs_t::answer(). Removed the (now) redundant saves of these
user fields from answer().