[fix] Avoid to display eponym group

conf/config.json

@@ -22,9 +22,10 @@
       "ldap_configuration_active": "1",
       "ldap_display_name": "displayname",
       "ldap_email_attr": "mail",
+      "ldapExperiencedAdmin": "1",
       "ldap_expert_username_attr": "uid",
       "ldap_group_display_name": "cn",
-      "ldap_group_filter": "objectClass=posixGroup",
+      "ldap_group_filter": "(&(objectclass=top)(memberUid=*))",
       "ldap_group_filter_mode": "0",
       "ldap_groupfilter_objectclass": "posixGroup",
       "ldap_group_member_assoc_attribute": "memberUid",