add function to get_price_w_tax in dash

sale.py

@@ -33,8 +33,6 @@ class Sale(metaclass=PoolMeta):
             user = User(user_id)
             shop = user.shop
 
-        print(args, '......................................args', sep='\n')
-        print(ctx, '......................................ctx', sep='\n')
         today = date.today()
         for v in args['lines']:
             if v.get('id'):
@@ -410,6 +408,12 @@ class Sale(metaclass=PoolMeta):
         }
         return res
 
+    @classmethod
+    def dash_get_amount_w_tax(cls, args):
+        Product = Pool().get('product.product')
+        product = Product(args['product'])
+        return product.template.compute_list_price_w_tax(args['list_price'])
+
 
 class AppDelivery(ModelSQL, ModelView):
     'App Delivery'