chore: reset all pointer value

Signed-off-by: Manish Dait <daitmanish88@gmail.com>

Author: manishdait

src/hiero_sdk_python/transaction/chunked_transaction.py

@@ -149,6 +149,7 @@ def freeze_with(self, client: Client) -> ChunkedTransaction:
 
             self._transaction_body_bytes[self._transaction_ids[chunk]] = node_bytes
 
+        self._current_chunk_index = 0
         self._current_transaction_id_index = 0
 
         return super().freeze_with(client)