Update WpLoader.php

[nigrosimone]

Make sure there's no newlines or whitespace before the opening php tag

$file_data = "
<?php

dump a php file with a new line at the beginning

<?php

[szepeviktor]

Make sure there's no newlines or whitespace before the opening php tag

Could you add meaningful commit message?
When we will have 100+ commit no one will know what it is for.