[FIX] website_sale_digital: check product tmpl sudo

For example the portal user has restricted access to product template,
this can lead to an issue that should not be in this instance that is
checking if the product template correspond to a product sold.

opw-748480
closes #17871

addons/website_sale_digital/controllers/main.py

@@ -85,7 +85,7 @@ class WebsiteSaleDigital(website_account):
 
         # Also check for attachments in the product templates
         elif res_model == 'product.template':
-            P = request.env['product.product']
+            P = request.env['product.product'].sudo()
             template_ids = map(lambda x: P.browse(x).product_tmpl_id.id, purchased_products)
             if res_id not in template_ids:
                 return redirect(self.orders_page)