Remove from cached members if killing a member without caching (#49)

src/mod/irc.mod/irc.c

@@ -1173,6 +1173,7 @@ killmember(struct chanset_t *chan, char *nick, bool cacheMember)
     // Don't delete here, will delete when it expires from the cache.
     (*chan->channel.cached_members)[x->userhost] = x;
   } else {
+    chan->channel.cached_members->remove(x->userhost);
     delete_member(x);
   }