[Feat] : 기본 이미지 설정 변경

src/main/java/kr/co/studyhubinu/studyhubserver/user/service/UserService.java

@@ -24,7 +24,7 @@
 @Transactional(readOnly = true)
 public class UserService {
 
-    private static final String BASIC_PROFILE_IMAGE = "https://mystudyhubbucket.s3.ap-northeast-2.amazonaws.com/avatar_xl%404x.png";
+    private static final String BASIC_PROFILE_IMAGE = "https://mystudyhubbucket.s3.ap-northeast-2.amazonaws.com/avatar_s%404x.png";
     private final UserRepository userRepository;
     private final PasswordEncoder passwordEncoder;
     private final UserActivityFinder userActivityFinder;