Fixes relaybot plugin relying on a non existant parser

Change-Id: I86b948e6a3b6f84315c78766b814f7747263b0b9
Reviewed-on: http://gerrit.dmdirc.com/1132
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>
Reviewed-by: Chris Smith <chris@dmdirc.com>

src/com/dmdirc/addons/relaybot/plugin.config

   id=50
 
 requires:
-  parent=parser_irc
+  parent=irc
 
 defaults:
   colourFullName=true