[FIX] website: onchange new record adaptation

Before this commit, when you go on website config settings, you can't save.
This is because the website default lang field is not set anymore (supposed to
be set in onchange), and since it is hidden in the view if only one language,
there is no clue about the error field.

Following d0bb596f1d51b, x2many fields of new records are new records, meaning
that:
`self.many2one in self.x2many`
is not true anymore since self.x2many is a new record.

Also:
`self.many2one = self.x2many[0]`
is not working as before, the new record is not saved in the many2one

closes odoo/odoo#33716

Signed-off-by: Raphael Collet (rco) <rco@openerp.com>

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