[*] MO PayPal : Fix 404 after payment success

Page not found after a click on "back to shop" link on paypal payment page.
Url is : /order-confirmation.php?id_cart=1&id_module=168&key=9784552759d3e567de6150a2e61997f9
instead of : /index.php?controller=order-confirmation&id_cart=1&id_module=168&key=9784552759d3e567de6150a2e61997f9