Fixed form control is not focusable #687 (#837)

public/js/index.js

             switch (authType) {
                 case '2':     // LDAP
                     $('.ldap').show();
-                    $('.ldap div.required input').attr('required', 'required');
+                    $('.ldap div.required:not(.dldap) input').attr('required', 'required');
                     break;
                 case '3':     // SMTP
                     $('.smtp').show();
                     break;
                 case '5':     // LDAP
                     $('.dldap').show();
-                    $('.dldap div.required input').attr('required', 'required');
+                    $('.dldap div.required:not(.ldap) input').attr('required', 'required');
                     break;
             }