Tell users that "Tor unexpectedly exited" is not so bad.

It's pretty common to receive a "Tor unexpectedly exited" error message from tor-launcher. I see this a lot on Windows, often on first run. This is not so precise to reproduce, because often if the user just tries to connect again, it will go away, and they will be able to get online. Please add a phrase like "Please try again." to the error window.