[FIX] payment, payment_stripe_sca: multiwebsite base_url

Have a multiwebsite setup
have stripe installed for one of the two websites

Make an order on that website and try to pay with stripe

Before this commit, the transaction doesn't come back to odoo's
payment success controller
This was because the return url was set to the web base url ICP

After this commit, the payment success page is opened as we took
the request's url as the return url

OPW 2070428

closes odoo/odoo#36979

Signed-off-by: Lucas Perais (lpe) <lpe@odoo.com>