Whole Page Nav throws javascript error if href has slashes

If the href goes to a different page (like /tv/ways-to-watch), we get an error dropped in the javascript console. 

The line that throws the error [is this one](https://github.com/skyglobal/web-toolkit/blob/master/app/src/js/toolkit/components/in-page-nav.js#L176), because it's trying to do a jQuery select on an element that has a slash in the selector.