Redraw the screen when a ObWindow is destroyed, but not on every related event

Redraw the screen when a ObWindow is destroyed, but not on every related event

We won't get an event we recognize is a window if we destroy the window
 (such as a MenuFrame going away), as the event will no longer be tracable
 to that window.
Also don't redraw on every map/unmap/configurenotify we see, just ones for
 the top-level windows.