refactor: move Restrictions d'accès aux fichiers from contenus.php to acces.php, cleanup section

app/public/admin/actions/settings.php

@@ -162,8 +162,10 @@ $_SESSION['csrf_token'] = bin2hex(random_bytes(32));
 
 // Redirect back to wherever the form came from, defaulting to parametres
 $redirect = '/admin/parametres.php';
-if (in_array($section, ['formulaire_restrictions', 'formulaire_acces', 'objet_types'], true)) {
+if (in_array($section, ['formulaire_acces', 'objet_types'], true)) {
     $redirect = '/admin/contenus.php';
+} elseif ($section === 'formulaire_restrictions') {
+    $redirect = '/admin/acces.php';
 }
 header('Location: ' . $redirect);
 exit;