[FIX] point_of_sale: discount applied twice

* Setup an IoTBox connected to a receipt printer
* In POS Config:
- IoT Box: check "IoTBox", set the IP of the Box and check "Receipt Printer"
- Pricing: Select "Tax-Included Price"
* Start the POS, select any product
* Click on "Disc" on the virutal keyboard on the bottom left of the POS
* Enter the amount of the discount
* Validatate payment (Click "Payment" > "Cash" > Enter Amount > "Validate")
* A ticket should print on the receipt printer:
- The price in the rigth column is correct

Current behaviour:
* In the left column, it shows : Product name, Base price, Discount: X%, 1 x Price --> This price is not correct, it shows the price with the discount applied twice.

Expected behaviour:
* Discount applied once everywhere on ticket.

task-1978564

closes odoo/odoo#34278

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

addons/point_of_sale/static/src/js/models.js

@@ -1637,9 +1637,9 @@ exports.Orderline = Backbone.Model.extend({
     },
     get_display_price_one: function(){
         var rounding = this.pos.currency.rounding;
-        var price_unit = this.get_unit_price() * (1.0 - (this.get_discount() / 100.0));
+        var price_unit = this.get_unit_price();
         if (this.pos.config.iface_tax_included !== 'total') {
-            return round_pr(price_unit, rounding);
+            return round_pr(price_unit * (1.0 - (this.get_discount() / 100.0)), rounding);
         } else {
             var product =  this.get_product();
             var taxes_ids = product.taxes_id;

addons/point_of_sale/static/src/xml/pos.xml

@@ -791,8 +791,8 @@
                             <left><t t-esc='line.product_name_wrapped[0]' /></left>
                             <right><value t-att-value-decimals='pos.currency.decimals'><t t-esc='line.price_display' /></value></right>
                         </line>
+                        <t t-call="XmlReceiptWrappedProductNameLines"/>
                     </t>
-                    <t t-call="XmlReceiptWrappedProductNameLines"/>
                     <t t-if='!simple'>
                         <line><left><t t-esc='line.product_name_wrapped[0]' /></left></line>
                         <t t-call="XmlReceiptWrappedProductNameLines"/>