fix: 로직 수정 (#236)

Co-authored-by: 나용준 <141994188+youngJun99@users.noreply.github.com>

Author: yongjun0511

cherrypic-api/src/main/java/org/cherrypic/domain/event/service/EventServiceImpl.java

@@ -135,7 +135,7 @@ public void addImages(Long eventId, EventImageAddRequest request) {
         validateSubscriptionNotExpired(event.getAlbum());
 
         validateAllImageExistence(distinctImageIds);
-        validateAllImageAlbum(distinctImageIds, eventId);
+        validateAllImageAlbum(distinctImageIds, event.getAlbum().getId());
 
         List<Image> images = getAllUnmappedImagesById(eventId, distinctImageIds);
         if (images.isEmpty()) return; // 사용자가 모두 해당 event에 이미 속하는 사진만 고른 경우