Fix twitter parser showing error when trying to rejoin &twitter

Fixes CLIENT-149

Change-Id: I02748a320a68dc64a3dc1d982c6afcec187dbde2
Reviewed-on: http://gerrit.dmdirc.com/1748
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>
Reviewed-by: Greg Holmes <greg@dmdirc.com>

src/com/dmdirc/addons/parser_twitter/Twitter.java

         for (final ChannelJoinRequest request : channels) {
             final String channel = request.getName().trim();
 
-            if (isValidChannelName(channel) && getChannel(channel) == null && !channel.equalsIgnoreCase(mainChannelName)) {
+            if (channel.equalsIgnoreCase(mainChannelName)) {
+                // The client is always in this channel, so ignore joins for it
+                continue;
+            }
+
+            if (isValidChannelName(channel) && getChannel(channel) == null) {
                 final TwitterChannelInfo newChannel = new TwitterChannelInfo(channel, this);
                 newChannel.addChannelClient(new TwitterChannelClientInfo(newChannel, myself));
                 if (channel.matches("^&[0-9]+$")) {
 
     /**
      * Send a Debug Message using the parser debug api.
-     * 
+     *
      * @param code Debug Code for the message.
      * @param message Content of the message.
      */
 
     /**
      * This method will send data to the NumericListener and the DataInListener
-     * 
+     *
      * @param numeric Numeric
      * @param token Tokenised Representation.
      */
 
     /**
      * Let the user know twitter failed in some way.
-     * 
+     *
      * @param message Message to send to the user
      */
     private void twitterFail(final String message) {