Update submodules: plugins (new commits)

plugins:
    14ea5b3 Greg Holmes <greg@dmdirc.com>
            Fix duplicate frame managers.

            Fixes-Issue: CLIENT-416
            Gerrit: http://gerrit.dmdirc.com/2947

Change-Id: Ic70d2a9c9316ea7ed89f74f844fb91b1ce6fe472