[FIX] website_sale: make test more reliable

The test test_update_cart_zero_qty was checking the total amount
of the cart, but depending on installed localizations, the taxes
vary and the test can fail.

This commit changes the check to the untaxed amount to make sure
the test only depends on the sales price of the product defined in
the test setup.

closes odoo/odoo#130319

X-original-commit: a2c693795081953ed0ba07bfad210701fcf6f1f0
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

addons/website_sale/tests/test_website_sale_cart.py

@@ -97,7 +97,7 @@ class WebsiteSaleCart(TransactionCase):
             # add the product to the cart
             self.WebsiteSaleController.cart_update_json(product_id=product.id, add_qty=1)
             sale_order = website.sale_get_order()
-            self.assertEqual(sale_order.amount_total, 1150.0)
+            self.assertEqual(sale_order.amount_untaxed, 1000.0)
 
             # remove the product from the cart
             self.WebsiteSaleController.cart_update_json(product_id=product.id, line_id=sale_order.order_line.id, set_qty=0)