chore: room.getGameSetting.getQuizId를 room.getQuizId 메서드로 교체

Author: dlsrks1021

backend/src/main/java/io/f1/backend/domain/game/app/RoomService.java

@@ -310,7 +310,7 @@ public void reconnectSendResponse(Long roomId, UserPrincipal principal) {
         String destination = getDestination(roomId);
         String userDestination = getUserDestination();
 
-        Long quizId = room.getGameSetting().getQuizId();
+        Long quizId = room.getQuizId();
         Quiz quiz = quizService.findQuizById(quizId);
 
         messageSender.sendBroadcast(