[FIX] website_sale_wishlist: new price

- Create a Public Pricelist without discounts
- Create a pricelist with a discount for all products, with 'Discount
  Policy' set to 'Show public price & discount to the customer'
- Assign the discount pricelist to the administrator partner
- Go to the eCommerce as public user (or any user with the Public
  Pricelist as default)
- Add a product to the Wishlist
- Go to the Wishlist

The discount of the admin pricelist is shown.

This is because the `product.wishlist` is browsed as superuser and the
computed field `price_new` depends on the user (ultimately through
`_website_price`)

opw-1912726

closes odoo/odoo#30358

addons/website_sale_wishlist/models/product_wishlist.py

@@ -44,7 +44,7 @@ class ProductWishlist(models.Model):
             "&",
             ("partner_id", "=", False),
             ("session", "=", self.env.user.current_session),
-        ]).filtered('product_id.product_tmpl_id.website_published')
+        ]).filtered('product_id.product_tmpl_id.website_published').sudo(user=self.env.user)
 
     @api.model
     def _add_to_wishlist(self, pricelist_id, currency_id, website_id, price, product_id, partner_id=False, session=False):