feat: 포트폴리오 썸네일 화질 개선 (#108)

Author: dldusgh318

src/main/java/modelly/modelly_be/global/s3/S3Uploader.java

@@ -89,7 +89,7 @@ public PresignedUrlListResponse generatePresignedUrlList(String folder, int file
         String thumbnailKey;
         String thumbnailUrl;
 
-        if (folder.equals("recruitments")) {
+        if (folder.equals("recruitments") || folder.equals("portfolios")) {
             thumbnailKey = String.format("%s/%s/originals/%s_main", folder, folderId, folderId);
             thumbnailUrl = "https://" + bucket + ".s3." + region + ".amazonaws.com/" + thumbnailKey;
         } else {