[FIX] base: res.partner.bank sequence

`res.partner.bank` is ordered by sequence, but:
- there is no default value
- there is no widget handle to set it

Therefore, methods such as `_get_partner_bank_id` might retrieve an
unexpected value.

To avoid this:
- we fallback to sort by ID
- we add a default value
- we add the widget handle

opw-1948964

closes odoo/odoo#32300

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>