Fix test for navigation disabling for external users

htdocs/product/card.php

htdocs/product/composition/card.php

htdocs/product/document.php

htdocs/product/fournisseurs.php

htdocs/product/info.php

htdocs/product/note.php

htdocs/product/price.php

htdocs/product/stats/card.php

htdocs/product/stats/commande.php

htdocs/product/stats/commande_fournisseur.php

htdocs/product/stats/contrat.php

htdocs/product/stats/facture.php

htdocs/product/stats/facture_fournisseur.php

htdocs/product/stats/propal.php

htdocs/product/stock/card.php

htdocs/product/stock/info.php

htdocs/product/stock/mouvement.php

htdocs/product/stock/product.php

htdocs/product/stock/productlot_card.php

htdocs/product/traduction.php