feat: show room prices in room assignment form field

tests/Form/Service/ParticipantAssignedRoomFieldHandlerTest.php

@@ -331,8 +331,8 @@ class ParticipantAssignedRoomFieldHandlerTest extends TestCase
     private function createRoomSelection(int $roomId, string $label, int $capacity, int $quantity): RoomSelectionDto
     {
         $selection = new RoomSelectionDto();
-        $selection->roomId = $roomId;
-        $selection->roomLabel = $label;
+        $selection->id = $roomId;
+        $selection->label = $label;
         $selection->capacity = $capacity;
         $selection->quantity = $quantity;