windowManager: Add "opacity: 0" to minimize ease animation

Extensions like dash-to-dock use set_icon_geometry() to window.
This changes the dest and scale of ease animation of minimize and
makes it looks very strange. By setting dest opacity to 0 the animation
could be more natural.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2968>
(cherry picked from commit 5d1a0cc525)

js/ui/windowManager.js

@@ -1165,6 +1165,7 @@ var WindowManager = class {
             }
 
             actor.ease({
+                opacity: 0,
                 scale_x: xScale,
                 scale_y: yScale,
                 x: xDest,