[FIX] website_sale: show correct pre-discount price on website

# Steps to reproduce

* install eCommerce and Sales
* go to settings and activate `Discounts`, `Pricelists` and
   set `Display Product Prices`  to `Tax Included`.
* create a pricelist with a discount, making sure to set (in the
  configuration tab):
  * `Discount Policy` to `Show public price & discount to the customer`
  * `Selectable` to `true`
* go to a product's page, select the pricelist you made and add the product
  to the cart.
* go to the shopping cart

# The Issue

On the shopping cart page, the pre-discount price should be tax-included
,but it is not.

opw-3112462

closes odoo/odoo#108935

X-original-commit: f4095614e8a875d66efbbb8c579c73c52b8a1c1c
Signed-off-by: William Braeckman (wbr) <wbr@odoo.com>

addons/website_sale/views/templates.xml

@@ -1461,7 +1461,7 @@
                                 <span t-field="line.price_reduce_taxinc" style="white-space: nowrap;" t-options="{'widget': 'monetary', 'display_currency': website_sale_order.currency_id}"/>
                             </t>
                             <t t-if="line.discount">
-                                <del t-attf-class="#{'text-danger mr8'}" style="white-space: nowrap;" t-esc="line.price_unit" t-options="{'widget': 'monetary', 'display_currency': website_sale_order.currency_id}" />
+                                <del t-attf-class="#{'text-danger mr8'}" style="white-space: nowrap;" t-esc="combination_info['list_price']" t-options="{'widget': 'monetary', 'display_currency': website_sale_order.currency_id}" />
                             </t>
                             <small t-if="not line._is_not_sellable_line() and line.product_id.base_unit_price"
                                 class="cart_product_base_unit_price d-block text-muted"