fixed correctly using defined draw order of global animations

fixed correctly using defined draw order of global animations

Before this change, there was only limited support for the attribute
".draw_order" for global animations, which did not work correctly if
the global animations had different game modes defined (like ".MAIN"),
as global animations were drawn in numerical game mode order, so draw
order was ignored between game modes and also between main animations.

With this change, global animations will really be drawn with their
defined draw order.