New Enhancement: the "Best Games" button now honors state of the "all games" checkbox

[whelanh]

If you have applied a filter/Header Search to your database, you can see the Tree view of that subset of games by un-checking the "all games" checkbox at the bottom of the Tree window. However, when you pressed the "Best Games" button at the lower left of the Tree window, all the games in your database appear in the Best Games window, not just the subset you filtered for. This newest enhancement makes it so that the games that appear in the Best Games window will just be the filtered subset if you have the "all games" checkbox unchecked.