Partially fix authenticated conference

'this' is the Window, 'self' is the Moderator

Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>

modules/xmpp/moderator.js

                 var toDomain
                     = Strophe.getDomainFromJid(error.getAttribute('to'));
                 if (toDomain !==
-                    this.xmppService.options.hosts.anonymousdomain) {
+                    self.xmppService.options.hosts.anonymousdomain) {
                     //FIXME:  "is external" should come either from
                     // the focus or config.js
                     self.externalAuthEnabled = true;