fix #2130

We load registered channels unconditionally; reloading them again on rehash
is incorrect. This caused buggy behavior when channel registration was
disabled in the config, but some registered channels were already loaded.

irc/server.go

@@ -702,9 +702,6 @@ func (server *Server) applyConfig(config *Config) (err error) {
  if !oldConfig.Accounts.NickReservation.Enabled {
  server.accounts.buildNickToAccountIndex(config)
  }
- if !oldConfig.Channels.Registration.Enabled {
- server.channels.loadRegisteredChannels(config)
- }
  // resize history buffers as needed
  if config.historyChangedFrom(oldConfig) {
  for _, channel := range server.channels.Channels() {