[php-src] Issue #22631: mysqli double increments num_active_persistent when using real_connect

Issue: https://github.com/php/php-src/issues/22631
Author: bavis-m

### Description

The following code:

```php
<?php

$use_real_connect = true;

$host = "p:localhost";
$user = "root";
$password = "password";

for ($i = 0; $i < 100; $i++)
{
  if ($use_real_connect)
  {
    $mysql = mysqli_init();
    mysqli_real_connect($mysql, $host, $user, $password);
  }
  else
  {
    $mysql = mysqli_connect($host, $user, $password);
  }
  mysqli_close($mysql);
}

$stats = mysqli_get_links_stats();
var_dump($stats);
```

Resulted in this output:
```
array(3) {
  ["total"]=>
  int(0)
  ["active_plinks"]=>
  int(99)
  ["cached_plinks"]=>
  int(1)
}
```

But I expected this output instead:
```
array(3) {
  ["total"]=>
  int(0)
  ["active_plinks"]=>
  int(0)
  ["cached_plinks"]=>
  int(1)
}
```

The code gives the correct output if you turn off the `$use_real_connect` flag.

This is caused by the persistent branch of `mysqli_common_connect` incrementing `num_inactive_persistent` (mysqli_nonapi.c:179 in tag php-8.5.8) when a persistent connection is reused based on the connection hash, then jumping to the `end:` label, and incrementing it again under this condition:

```c
// mysqli_nonapi.c:296
if (persistent && (new_connection || is_real_connect)) {
    MyG(num_active_persistent)++;
}
```

Because `mysql_close` has already been called on the persisted connection, we get a total increase in active persistent connections by 1.

I'm not entirely sure why ` || is_real_connect` is needed in that check, it looks to me like `new_connection` still covers the persistent case.

### PHP Version

```plain
PHP 8.5.8 (cli) (built: Jul  6 2026 16:48:54) (NTS)
Copyright (c) The PHP Group
Built by https://github.com/docker-library/php
Zend Engine v4.5.8, Copyright (c) Zend Technologies
    with Zend OPcache v8.5.8, Copyright (c), by Zend Technologies
```

### Operating System

Debian 13.5