Update submodules: plugins (new commits)

plugins:
    11ac6fc Chris Smith <chris@dmdirc.com>
            Also remove the setting from the UI.

            Gerrit: http://gerrit.dmdirc.com/3410

    fc953d7 Chris Smith <chris@dmdirc.com>
            Tidy the FD plugin.

            - Remove strict escape option as turning it off seems to offer no
              benefit and is a bit scary.

            - Switch to using HTML escaping provided by Guava.

            - Use an array instead of a crazy inefficient list that's converted.

            Gerrit: http://gerrit.dmdirc.com/3409

Change-Id: I80603ed1dda6b7ac4de83e1245aa691d89a3ce3e