bug #36030 [SecurityBundle] Minor fix in LDAP config tree builder (He…

…ahDude)

This PR was merged into the 4.4 branch.

Discussion
----------

[SecurityBundle] Minor fix in LDAP config tree builder

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | ~
| License       | MIT
| Doc PR        | ~

Continuation of #35910 for 4.4.

Commits
-------

468a201 [SecurityBundle] Minor fix in LDAP config tree builder

src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/UserProvider/LdapFactory.php

@@ -48,6 +48,7 @@ public function getKey()
     public function addConfiguration(NodeDefinition $node)
     {
         $node
+            ->fixXmlConfig('extra_field')
             ->fixXmlConfig('default_role')
             ->children()
                 ->scalarNode('service')->isRequired()->cannotBeEmpty()->defaultValue('ldap')->end()