[fix](backup) Fix compressed backup job (#43197)

This was introduced in #42462

fe/fe-core/src/main/java/org/apache/doris/backup/BackupJob.java

@@ -1022,7 +1022,7 @@ public void write(DataOutput out) throws IOException {
             ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
             try (GZIPOutputStream gzipStream = new GZIPOutputStream(byteStream)) {
                 try (DataOutputStream stream = new DataOutputStream(gzipStream)) {
-                    writeOthers(out);
+                    writeOthers(stream);
                     written = stream.size();
                 }
             }