[FIX] point_of_sale: fix decimals converted into units after parse

In a POS session, in a language that does not use dot (.) as decimal separator (i.e. French),
when adding a Product, it can happen that the decimal part of the price is not converted
correctly after applying "field_utils.parse.float". (i.e. 2.69 becomes 269)
The issue happens in "set_unit_price" function.

To prevent this to happen, "field_utils.parse.float" will only be applied if the price given
as parameter is not a number.

opw-2357848

closes odoo/odoo#60344

X-original-commit: 7687732a8a2e1afe87272fc31ccd4437ed9a8db1
Signed-off-by: Anh Thao PHAM <kitan191@users.noreply.github.com>

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

@@ -1924,7 +1924,9 @@ exports.Orderline = Backbone.Model.extend({
     // changes the base price of the product for this orderline
     set_unit_price: function(price){
         this.order.assert_editable();
-        var parsed_price = isNaN(parseFloat(price)) ? 0 : field_utils.parse.float('' + price)
+        var parsed_price = !isNaN(price) ?
+            price :
+            isNaN(parseFloat(price)) ? 0 : field_utils.parse.float('' + price)
         this.price = round_di(parsed_price || 0, this.pos.dp['Product Price']);
         this.trigger('change',this);
     },