FIX] website_sale: autoconfirm free SO

For now the SO made with an amount of 0, are not automatically velidated
as there are no transactions. To avoid this problem, we are calling
actionn_confirm on the order with amount 0.

closes odoo/odoo#33176

Signed-off-by: pimodoo <pimodoo@users.noreply.github.com>

addons/website_sale/controllers/main.py

@@ -970,6 +970,7 @@ class WebsiteSale(ProductConfiguratorController):
             return request.redirect('/shop')
 
         if order and not order.amount_total and not tx:
+            order.with_context(send_email=True).action_confirm()
             return request.redirect(order.get_portal_url())
 
         # clean context and session, then redirect to the confirmation page