[php-src] Issue #20792: Running `run-tests.php` with a PHP executable in a path having whitespace results in an error

Issue: https://github.com/php/php-src/issues/20792
Author: sharadraju

### Description

My PHP executable is in "C:\Program Files". When I ran `php run-tests.php`, this gives an error.
```
'C:\Program' is not recognized as an internal or external command

```

The reason is that the `run_test()` function uses $orig_php variable without being escaped

Platforms : Windows 11
PHP version: 8.3

The fix is quite simple.

we have to move $orig_php=$php after the line `$php = escapeshellarg($php);` in run_test() function

### PHP Version

```plain
> PHP -v
PHP 8.3.9 (cli) (built: Jul  2 2024 18:18:06) (ZTS Visual C++ 2019 x64)
Copyright (c) The PHP Group
Zend Engine v4.3.9, Copyright (c) Zend Technologies
```

### Operating System

Windows 11