Merge pull request #341 from Board-Buddy/feature/#340

[Fix] 프로필 이미지 수정시 발생하는 이슈 해결 작업

Author: runtime-zer0

src/main/java/sumcoda/boardbuddy/service/ProfileService.java

@@ -170,7 +170,7 @@ public void updateProfile(String username, MemberRequest.UpdateProfileDTO update
         if (oldProfileImage != null) {
             final String deleteKey = buildProfileImageS3RequestKey(oldProfileImage.getS3SavedObjectName());
 
-            member.assignProfileImage(null);
+            profileImageRepository.delete(oldProfileImage);
 
             try {
                 DeleteObjectRequest deleteObjectRequest = buildDeleteObjectRequest(bucketName, deleteKey);