fix #1577

Remove debugging loglines for truncation

irc/channel.go

 	if !client.server.Config().Server.Compatibility.allowTruncation {
 		if !validateSplitMessageLen(histType, details.nickMask, chname, message) {
 			rb.Add(nil, client.server.name, ERR_INPUTTOOLONG, details.nick, client.t("Line too long to be relayed without truncation"))
-			// TODO(#1577) remove this logline:
-			client.server.logger.Debug("internal", "rejected truncation-requiring DM from client", details.nick)
 			return
 		}
 	}

irc/client.go

 			continue
 		} else if err == ircmsg.ErrorBodyTooLong && !client.server.Config().Server.Compatibility.allowTruncation {
 			session.Send(nil, client.server.name, ERR_INPUTTOOLONG, client.Nick(), client.t("Input line too long"))
-			// TODO(#1577) remove this logline:
-			client.server.logger.Debug("internal", "rejected MaxLineLen-exceeding line from client", client.Nick())
 			continue
 		} else if err != nil {
 			client.Quit(client.t("Received malformed line"), session)

irc/handlers.go

 		if !client.server.Config().Server.Compatibility.allowTruncation {
 			if !validateSplitMessageLen(histType, client.NickMaskString(), tnick, message) {
 				rb.Add(nil, server.name, ERR_INPUTTOOLONG, client.Nick(), client.t("Line too long to be relayed without truncation"))
-				// TODO(#1577) remove this logline:
-				client.server.logger.Debug("internal", "rejected truncation-requiring channel message from client", details.nick)
 				return
 			}
 		}