[FIX] website_sale: created a company record when entering VAT number in...

... checkout of the webshop, it used to create customer and not a company, opw:615392

when entering VAT number in the checkout of shop, it should create customer as a company.
- install module ecommerce(website_sale) and base_vat(to get field VAT on checkout form)
- in the checkout process fill customer details, enter valid IBAN/VAT number
- confirm the operation, it creates a customer(is_company=False), but it should create customer as company.