Update submodules: plugins (new commits)

plugins:
    8daaf97 Greg Holmes <greg@dmdirc.com>
            Fix frame manager instantiation.

            Fixes-Issue: CLIENT-413
            Gerrit: http://gerrit.dmdirc.com/2819

Change-Id: I18eb2db8dc20f6ebf639b7b65a7e53cf96febc09