without html.formprojet.class.php called, not possible create invoice template

cf. https://github.com/Dolibarr/dolibarr/issues/6614
without this class AND module Projects disabled, it's not possible to create an invoice template. So I pulled out the call of the class from the condition.

htdocs/compta/facture/fiche-rec.php

@@ -35,8 +35,9 @@ require_once DOL_DOCUMENT_ROOT.'/product/class/product.class.php';
 require_once DOL_DOCUMENT_ROOT.'/core/class/html.formother.class.php';
 if (! empty($conf->projet->enabled)) {
     require_once DOL_DOCUMENT_ROOT . '/projet/class/project.class.php';
-    require_once DOL_DOCUMENT_ROOT . '/core/class/html.formprojet.class.php';
+    //require_once DOL_DOCUMENT_ROOT . '/core/class/html.formprojet.class.php';
 }
+require_once DOL_DOCUMENT_ROOT . '/core/class/html.formprojet.class.php';
 require_once DOL_DOCUMENT_ROOT . '/core/class/doleditor.class.php';
 require_once DOL_DOCUMENT_ROOT . '/core/lib/invoice.lib.php';