[FIX] website_sale: show correctly the acquirer name

Like here https://github.com/odoo/odoo/blob/14.0/addons/payment/views/payment_templates.xml#L69

, if the acquirer have display_as, it is more logical to shpw everywhere this field.

closes odoo/odoo#119295

Signed-off-by: Valentin Chevalier <vcr@odoo.com>