Update submodules: plugins (new commits)

plugins:
    e822032 Greg Holmes <greg@dmdirc.com>
            Use events for title changes in MainFrame.

            Gerrit: http://gerrit.dmdirc.com/3759

Change-Id: I396a049f46e4caad70efc3e8a7334f81c07a4226
Update submodules: plugins (new commits)

plugins:
    e0818b5 Greg Holmes <greg@dmdirc.com>
            Remove unused ctor param in MainFrame.

            Gerrit: http://gerrit.dmdirc.com/3760

Change-Id: I1aaab4c509786226ef0cff0c1be8abb5c2c4bf73