use the right selector for relaunchApplication (forgot the colon). Fixes #1604

Well duh, it was just a typo - missed the colon.

Caught you @craigotis ;-)
https://github.com/quicksilver/Quicksilver/commit/8cb92f9ed286f7fb1aa066de140b76cfe43065cf#L3R178

Is there a reason why you used `performSelector` as opposed to calling the method directly?