Code style for com_wrapper

Note there is a minor code change in the controller. Where the display method default value for the urlparams is changed from false to display (as it should always be an array) and brings it into strict standards compliance with the main function https://github.com/joomla/joomla-cms/blob/staging/libraries/legacy/controller/legacy.php#L641 ; This has 0 b/c implications as the variable isn't actually used anywhere in the function.