Fix navigation bug for Content Category links
Fix navigation bug for Content Category links

I introduced a bug last year when I added the ability to add links to
the menu that were links to somewhere else for the eCongress. I was
checking for whether a string existed in a JavaScripty way rather than a
Ruby way.

usgo/gocongress,usgo/gocongress,usgo/gocongress,usgo/gocongress