feat: cost unit for custom destinations

src/Controller/Administrative/System/Destination/DestinationTrait.php

@@ -38,6 +38,7 @@ trait DestinationTrait
             ->setHotelBusProId($hotel->getBusProId())
             ->setCountry($destinationDto->getCountry())
             ->setPickups($pickups)
+            ->setCostUnit($destinationDto->getCostUnit())
         ;
     }
 }