[FIX] website_sale: fix redirect on wrong coupon code
[FIX] website_sale: fix redirect on wrong coupon code

This commits fixes the case where you click on
edit address in eCommerce payment flow and you
type a wrong coupon code.

Without this commit, you are redirected at
/shop/payment instead of /shop/checkout

OPW-2290188

closes odoo/odoo#54641

X-original-commit: 0d658349483054bf30c8be483e2f42671e0ba024
Signed-off-by: Nicolas Martinelli (nim) <771435c469f83f6aa9c405ac5e1ed06314a94f2d@odoo.com>
Signed-off-by: Nicolas Lempereur (nle) <2907e499a003d1c3ab7944c0a40c6df46e3e3c2f@odoo.com>
Signed-off-by: Jason Van Malder (jvm) <f3b543dc99538be7ecc03fd24be010615c4059c2@odoo.com>

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