[FIX] point_of_sale: order product.product consistently with backend

In the backend product.product records are not just ordered on their
name, they are first ordered on default_code and then on name. The POS
should order records the same way.

opw-672284

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

@@ -317,7 +317,7 @@ exports.PosModel = Backbone.Model.extend({
         fields: ['display_name', 'list_price','price','pos_categ_id', 'taxes_id', 'barcode', 'default_code', 
                  'to_weight', 'uom_id', 'description_sale', 'description',
                  'product_tmpl_id'],
-        order:  ['sequence','name'],
+        order:  ['sequence','default_code','name'],
         domain: [['sale_ok','=',true],['available_in_pos','=',true]],
         context: function(self){ return { pricelist: self.pricelist.id, display_default_code: false }; },
         loaded: function(self, products){