Minor updater test improvements/additions

Change-Id: I83f60d4bc11aac49a86f50d3aea66e6ab508386a
Reviewed-on: http://gerrit.dmdirc.com/3205
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Update submodules: plugins (new commits)

plugins:
    523acd6 Chris Smith <chris@dmdirc.com>
            Use the right windowClosed method...

            Fixes-Issue: CLIENT-456
            Gerrit: http://gerrit.dmdirc.com/3204

Change-Id: I911591d37b6b36a1bfe32e32a4b669d8ea76f6c7