[BE] hotfix: s3 권한을 얻을 때 읽기 권한 추가 삭제 (#602)

* fix: s3 path 를 file full path 로 수정

* fix: 파일 확장자 앞에 . 추가

* fix: 권한 추가 삭제

backend/src/main/java/com/funeat/common/s3/S3Uploader.java

@@ -4,7 +4,6 @@
 import static com.funeat.exception.CommonErrorCode.UNKNOWN_SERVER_ERROR_CODE;
 
 import com.amazonaws.services.s3.AmazonS3;
-import com.amazonaws.services.s3.model.CannedAccessControlList;
 import com.amazonaws.services.s3.model.ObjectMetadata;
 import com.amazonaws.services.s3.model.PutObjectRequest;
 import com.funeat.common.ImageUploader;
@@ -78,7 +77,6 @@ private ObjectMetadata getMetadata(final MultipartFile image) {
 
     private PutObjectRequest getPutObjectRequest(final MultipartFile image, final String key,
                                                  final ObjectMetadata metadata) throws IOException {
-        return new PutObjectRequest(bucket, key, image.getInputStream(), metadata)
-                .withCannedAcl(CannedAccessControlList.PublicRead);
+        return new PutObjectRequest(bucket, key, image.getInputStream(), metadata);
     }
 }