Make some ChanServ ban checks see through hidden hosts.

Make some ChanServ ban checks see through hidden hosts.

src/chanserv.c (handle_join): Make this function see through hidden
    hosts when matching users against bans.  Add comment before the
    non-burst section; remove a redundant burst check there.
  (handle_auth): See through hidden hosts when checking against active
    bans.  Inactive ban check keeps MATCH_VISIBLE since bans on the true
    hostname should have already been applied.
  (handle_nick_change): Same as handle_auth.
git-archimport-id: srvx@srvx.net--2006/srvx--devo--1.3--patch-14