windows: fix color overlay
for 0.21.11, I had to disable the ColorOverlay in the several locations where was in use in the qml components for windows. this was a workaround for the overlay generating color squares instead of properly applying the effect. this might be caused by a failure to include some library or plugin with windeployqt.
a proper fix needs to be found: either finding the root cause, deprecating the overlay use in favor of colored pngs, or just simply removing the component conditionally for windows.