refactor: update path handling in addFolderToZipStream to use File object

Author: Pfeil

src/main/java/edu/kit/datamanager/ro_crate/writer/WriteZipStreamStrategy.java

@@ -157,7 +157,7 @@ private void saveToStream(DataEntity entity, ZipOutputStream zipStream, String p
         if (isDirectory) {
             ZipStreamUtil.addFolderToZipStream(
                     zipStream,
-                    entity.getPath().toAbsolutePath().toString(),
+                    entity.getPath().toFile(),
                     prefix + entity.getId());
         } else {
             ZipStreamUtil.addFileToZipStream(