Update submodules: plugins (new commits)

plugins:
    4fe44ff Greg Holmes <greg@dmdirc.com>
            Begin tidying up of WindowStatus Plugin.

            Gerrit: http://gerrit.dmdirc.com/3989

    ce637c1 Greg Holmes <greg@dmdirc.com>
            Fix Statusbar not showing components.

            Gerrit: http://gerrit.dmdirc.com/3988

Change-Id: I5291495b22874d16019df8abbe3c8f2ce9cda2f6