When a user in one of the whowas lists rejoins, their entry is removed from
the whowas list (and added to a channel nicklist). However the count of
entries in the whowas list wasn't being decremented, so eventually the client
thinks the lists are full when they're really empty... at this point only one
user at a time can be in the lists (so /WHOLEFT after a netsplit would only
show one user).
git-svn-id: svn://svn.code.sf.net/p/bitchx/code/trunk@77 13b04d17-f746-0410-82c6-800466cd88b0
