Bug#35247 - rpl_transaction.test produces warnings files

The test file tried to use a mysqltest command '--warning'
but there is no such command.

Changed '--warning' to '#--warning'.

mysql-test/t/rpl_transaction.test

@@ -39,7 +39,7 @@ COMMIT;
 BEGIN;
 INSERT INTO tmyisam VALUES (5);
 INSERT INTO tmyisam VALUES (6);
---warning 1196
+#--warning 1196
 ROLLBACK;
 
 SELECT * FROM tmyisam ORDER BY a;