[mythtv] mythgame - pagedown

[mmcconnell at uniserve.com]

A nice addition to mythgame is;

Adding 
        else if (action == "2")
            game_tree_list->pageUp();
        else if (action == "8")
            game_tree_list->pageDown();
To
        void GameTree::keyPressEvent(QKeyEvent *e)
In
        gametree.cpp