Bugfix. Avoid passing IQ to sendPresence.

converse.js

@@ -4956,9 +4956,9 @@
                                      * fetching the roster we are ready to receive presence
                                      * updates from our contacts.
                                      */
-                                    converse.roster.fetchFromServer(
-                                        converse.xmppstatus.sendPresence.bind(converse.xmppstatus)
-                                    );
+                                    converse.roster.fetchFromServer(function () {
+                                        converse.xmppstatus.sendPresence();
+                                    });
                                 } else if (converse.send_initial_presence) {
                                     /* We're not going to fetch the roster again because we have
                                      * it already cached in sessionStorage, but we still need to