message: prevent login form submission (fix
diff: @@ -345,7 +345,9 @@ jsxc = {
  form.off('submit');
  // Add jsxc login action to form
  - form.submit(function() {
  + form.submit(function(ev) {
  + ev.preventDefault();
  +
  jsxc.prepareLogin(function(settings) {
  if (settings !== false) {
  // settings.xmpp.onlogin is deprecated since v2.1.0
  