Fixed a couple of typos in irssi script.
Fixed a couple of typos in irssi script.

murgo/IrssiNotifier,varazir/IrssiNotifier,murgo/IrssiNotifier,murgo/IrssiNotifier,varazir/IrssiNotifier,varazir/IrssiNotifier,murgo/IrssiNotifier,varazir/IrssiNotifier