Fix compile error in DataRegion

Author: JackieTien97

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/DataRegion.java

@@ -1993,7 +1993,7 @@ private void deleteAllSGFolders(List<String> folder) {
 
   private void deleteAllObjectFiles(List<String> folders) {
     for (String objectFolder : folders) {
-      File dataRegionObjectFolder = fsFactory.getFile(objectFolder, dataRegionId);
+      File dataRegionObjectFolder = fsFactory.getFile(objectFolder, dataRegionIdString);
       try (Stream<Path> paths = Files.walk(dataRegionObjectFolder.toPath())) {
         paths
             .filter(Files::isRegularFile)