Fix formatting in PromotionMapper.php

Author: freerkminnema

src/Mappers/Vouchers/PromotionMapper.php

@@ -28,7 +28,7 @@ public function map(stdClass $data): Promotion
             $attributes ?? [],
             $data->type,
             $data->redemptions_per_voucher,
-            $media ?? null,
+            $media ?? null
         );
     }
 }