If re-establish a connection don't print the room history again. In case there there happened nothing at all since we got the room history on the last connection. And in case there were no new messages during the time we have been disconnected. Instead of printing the room history again we now print 'Re-established Connection'. This adds a bit of overhead since we save the timestamp upon every MUC message. See: https://github.com/profanity-im/profanity/issues/704