[REV][FIX] web: radio widget ignores required attribute

This reverts https://github.com/odoo/odoo/pull/87375



`auth_signup_uninvited` is be set as required in the
settings view but a value is missing in the case where the current
company has no website.
This then prevents the settings from being saved.
This could also be an issue with other settings in custom code.
We should revert this fix in stable.

opw-2819061

closes odoo/odoo#88568

Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>