libempathy/empathy-irc-network-manager.c: Fix typo similiar -> similar
libempathy/empathy-irc-network-manager.c: Fix typo similiar -> similar

Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets