[IMP] delivery_purchase: Set carrier_price when creating a picking

If we have a delivery price of 10 on the order, it is expected to show
10 on the picking (without needing to be set to that amount when set the
picking as done).

TT45656

Author: victoralmau

delivery_purchase/models/purchase_order.py

@@ -39,6 +39,7 @@ def _prepare_picking(self):
         res = super()._prepare_picking()
         if self.carrier_id:
             res["carrier_id"] = self.carrier_id.id
+            res["carrier_price"] = self.delivery_price
         return res
 
     def _create_delivery_line(self, carrier, price_unit):

delivery_purchase/tests/test_delivery_purchase.py

@@ -105,9 +105,11 @@ def test_delivery_purchase(self):
         self.assertEqual(self.purchase.delivery_price, 30)
 
     def test_picking_carrier_01(self):
+        self.assertEqual(self.purchase.delivery_price, 20)
         self.purchase.button_confirm()
         picking = self.purchase.picking_ids
         self.assertEqual(picking.carrier_id, self.carrier_fixed)
+        self.assertEqual(picking.carrier_price, 20)
         picking.carrier_id = self.carrier_rules.id
         self._action_picking_validate(picking)
         self.assertEqual(picking.carrier_price, 10)