Use \u0001 to suffix CTCP ACTIONs so they display correctly

CTCP ACTION requests always are prefixed and suffixed with `\x01`, for some reason they were being suffixed with `\x02` ("bold") for CTCP ACTIONS, which led to odd-looking messages:

![CTCP ACTION shows up as simply \x01ACTION ...](http://i.imgur.com/HzzTuL8.png)