Properly reset offToCornerId and apertureCorner when the effect closes

When the effect closes, all the extra data attached to the window
(offToCornerId and apertureCorner properties) are not valid anymore
and need to be reset right after the animation end.
also manage the two edge cases where a window either appeared or
got minimized while the effect was running to either show it or not

BUG: 454280


(cherry picked from commit 207c5900)