whitespace cleanup for urlhack_launch_url
GH-3: Remove the old browser detection code

Finally found a case where this breaks horribly:

* attempt launch an invalid url
* we panic, and think we can never launch a url again
* future non-http urls get run with the browser, with mixed results

While I could fix that actual bug, I'd rather remove the panic code,
which should never be being hit anyway.
GH-3: http://google.com stopped working, regex engine bug?