Use sonata_admin.admin.uniqid instead of sonata_admin.admin.root.uniqid

Resources/views/Form/form_admin_fields.html.twig

@@ -289,7 +289,7 @@ file that was distributed with this source code.
                                 "{{ req_param_name_page_number }}": page,
 
                                 // admin
-                                'uniqid': "{{ sonata_admin.admin.root.uniqid }}",
+                                'uniqid': "{{ sonata_admin.admin.uniqid }}",
                                 'code':   "{{ sonata_admin.admin.code }}",
                                 'field':  "{{ name }}"