Update submodules: plugins (new commits)

plugins:
    f2e48b0 Chris Smith <chris@dmdirc.com>
            Inject more things.

            Gerrit: http://gerrit.dmdirc.com/3038

    305ae67 Chris Smith <chris@dmdirc.com>
            Use DI in the server list dialog plugin.

            Gerrit: http://gerrit.dmdirc.com/3037

Change-Id: Ieefd3d97450936f236935a86e1b8ec6f5dccefe6