message: add missing write_batch call
diff: @@ -80,6 +80,10 @@ impl StorageBackend for RocksDBBackend {
  )?;
  }
  + (self.inner.deref() as &dyn KeyValueStoreWithSchema<MerkleStorage>).write_batch(
  + rocksb_batch,
  + )?;
  +
  Ok(())
  }
  