Fix error in public.js

static/functions/public.js

     }
   }
 
-  if ($('#keep2fa')) {
+  if ($('#keep2fa').length) {
     $('#2fa_tr').ghide()
     $('#keep2fa')[0].onclick = (e) => {
       $('#2fa_tr')[$('#keep2fa')[0].checked ? 'gshow' : 'ghide']()