Update submodules: plugins (new commits)

plugins:
    1bb3e67 Chris Smith <chris@dmdirc.com>
            Fix NPE in FD notifications plugin.

            We had two instances of the FDManager around - one for the command and
            once owned by the plugin. The command's instance was never loaded so
            had no icon.

            Fixes-Issue: CLIENT-471
            Gerrit: http://gerrit.dmdirc.com/3231

Change-Id: Ic6969ce5301427a73f2c816e5f278d6ff122519b