[CodingStyle] Skip by ref params on BinaryOpStandaloneAssignsToDirectRector

[samsonasik]

When it continue from by ref params, it should be skipped, as value changed via reference:

final class SkipByRefFromParamVariable
{
    public function run(&$first, &$second)
    {
        $first = 100;
        $second = 200;

        return $first <=> $second;
    }
}

[TomasVotruba]

👍