fix #409: BindDN field denies ActiveDirectory styles

lib/form/admin/securityPassportLdap.js

@@ -12,7 +12,7 @@ module.exports = form(
   field('settingForm[security:passport-ldap:isUserBind]').trim().toBooleanStrict(),
   field('settingForm[security:passport-ldap:bindDN]').trim()
       // https://regex101.com/r/jK8lpO/1
-      .is(/^(,?[^,=\s]+=[^,=\s]+){1,}$/, 'Bind DN is invalid. <small><a href="https://regex101.com/r/jK8lpO/1">&gt;&gt; Regex</a></small>'),
+      .is(/^(,?[^,=\s]+=[^,=\s]+){1,}$|^[^@\s]+@[^@\s]+$/, 'Bind DN is invalid. <small><a href="https://regex101.com/r/jK8lpO/3">&gt;&gt; Regex</a></small>'),
   field('settingForm[security:passport-ldap:bindDNPassword]'),
   field('settingForm[security:passport-ldap:searchFilter]'),
   field('settingForm[security:passport-ldap:attrMapUsername]'),