minor changes in muttng config

.muttng/conf/mailboxes

@@ -20,7 +20,6 @@ mailboxes =sys.reports
 mailboxes =sys.infos
 
 mailboxes =my.misc
-mailboxes =my.irc
 
 mailboxes =my.soft.weechat.ml.cvs
 mailboxes =my.soft.weechat.ml.dev