Fix replace count test

[timsehn]

Claude insists that this behavior matches MySQL. It consulted the docs and ran tests against MySQL.

I can confirm the tested behavior matches MariaDB which I have installed:

MariaDB [(none)]> CREATE DATABASE test_replace;
ERROR 1007 (HY000): Can't create database 'test_replace'; database exists
MariaDB [(none)]> DROP DATABASE IF EXISTS
    ->       test_replace;
Query OK, 1 row affected (0.057 sec)

MariaDB [(none)]> USE test_replace;
ERROR 1049 (42000): Unknown database 'test_replace'
MariaDB [(none)]> CREATE DATABASE test_replace;
Query OK, 1 row affected (0.003 sec)

MariaDB [(none)]> USE test_replace;
Database changed
MariaDB [test_replace]> CREATE TABLE test(pk BIGINT
    ->       PRIMARY KEY, v BIGINT);
Query OK, 0 rows affected (0.030 sec)

MariaDB [test_replace]> REPLACE INTO test
    ->       VALUES (1, 1);
Query OK, 1 row affected (0.001 sec)

MariaDB [test_replace]> REPLACE INTO test VALUES (1,
    ->       2);
Query OK, 2 rows affected (0.001 sec)

[timsehn]

Zach review this over Discord.