Fixed 'process_rows_in_ASYNC_STMT_EXECUTE_STORE_RESULT_CONT' not properly updating 'length' from copied last row after data copy

lib/mysql_connection.cpp

@@ -1648,6 +1648,9 @@ void MySQL_Connection::process_rows_in_ASYNC_STMT_EXECUTE_STORE_RESULT_CONT(unsi
 	// update 'stmt->result.data' to the new allocated memory and copy the backed last row
 	query.stmt->result.data = current;
 	memcpy((char *)current->data, (char *)lcopy->data, lcopy->length);
+	// update the 'current->length' with the length of the copied row
+	current->length = lcopy->length;
+
 	// we free the copy
 	free(lcopy);
 	// change the rows count to 1