[FIX] website_sale: price precision
[FIX] website_sale: price precision

- Set company currency as VND and Enable the Multi-currency with USD
- Create Pricelists for VND & USD, set them as 'Selectable'
- Without being logged, go to eCommerce
- Select the USD pricelist
- Open a product page

The price has zero decimals, while it should have 2.

When the product page is opened, a RPC call is performed on
`get_combination_info_website`:

https://github.com/odoo/odoo/blob/7612f2c55cd4795b109a3b3dc3099f280ce99a7f/addons/sale/static/src/js/product_configurator_mixin.js#L71

When the response is received, the price is updated in:

https://github.com/odoo/odoo/blob/7612f2c55cd4795b109a3b3dc3099f280ce99a7f/addons/sale/static/src/js/product_configurator_mixin.js#L472

However, `_priceToStr` uses the decimal precision of
`product.currency_id.decimal_places`:

https://github.com/odoo/odoo/blob/7612f2c55cd4795b109a3b3dc3099f280ce99a7f/addons/sale/static/src/js/product_configurator_mixin.js#L543

This is incorrect: it should be the currency of the website, not the
curency of the product.

opw-1947140

closes odoo/odoo#31770

Signed-off-by: Nicolas Martinelli (nim) <771435c469f83f6aa9c405ac5e1ed06314a94f2d@odoo.com>
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