🚑 fix(supann) Add missing "global $config" in etablissement contructor

This was missed when merging code from 1.4-dev.
Spotted by Sonar.

issue #5911

supann/admin/supannStructures/class_etablissement.inc

@@ -141,6 +141,8 @@ class etablissement extends simplePlugin
 
   function __construct ($dn = NULL, $object = NULL, $parent = NULL, $mainTab = FALSE)
   {
+    global $config;
+
     parent::__construct($dn, $object, $parent, $mainTab);
 
     if (empty($this->acl_base)) {