Tidy up the channel list modes pane.

Change-Id: Ifbe77fd01a01c4c3613515eb3499e803c9c236bd
Reviewed-on: http://gerrit.dmdirc.com/3133
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager
Tidy up some warnings in PMD

Change-Id: If943b18f76b17d259a0778ebed7383556c236e46
Reviewed-on: http://gerrit.dmdirc.com/3134
Reviewed-by: Chris Smith <chris@dmdirc.com>
Automatic-Compile: DMDirc Build Manager