Fixing a small issue with the Options Menu in Boot Mode

Hi,

If you open the first section of the Options Menu (the section containing Video, Audio, Language, Key Settings, and Joystick Settings) from Boot Mode, and then click Escape, the game will shutdown even though the Menu appears to be open.

This small update caches the result to '_menu_handler.IsActive()'.  After calling '_menu_handler.Update()', the state of the menu could have changed.  However, the remainder of the function expects the state of the menu prior to the update.

Thanks.