Clean up the `$methods` array

Clean up the `$methods` array

This was performed using:

    <?php

    namespace wcf\system\exporter;

    use ReflectionProperty;

    class AbstractExporter {}

    $files = glob('files/lib/system/exporter/*.php');

    foreach ($files as $file) {
    	require($file);
    	$class = 'wcf\\system\\exporter\\'.basename($file, ".class.php");
    	echo $class, \PHP_EOL;

    	$obj = new $class();
    	$prop = new ReflectionProperty($class, 'methods');
    	$prop->setAccessible(true);
    	$methods = $prop->getValue($obj);

    	foreach ($methods as $method) {
    		$method = 'export'.$method;

    		if (!\method_exists($obj, $method)) {
    			echo $method, \PHP_EOL;
    		}
    	}

    	foreach (\get_class_methods($obj) as $method) {
    		if (!\str_starts_with($method, 'export')) {
    			continue;
    		}

    		if (!\in_array(\preg_replace('/^export/', '', $method), $methods)) {
    			echo $method, \PHP_EOL;
    		}
    	}
    }