fix regression caused by the fix for NB#282411
fix regression caused by the fix for NB#282411

this was broken:
- open clock on top
- open widgetsgallery on top
- lock the screen
- swipe away the lockscreen
- swipe away widgetsgallery

=> now clock came on top because iconifyApps didn't move iconified windows
under desktop yet and sendSyntheticVisibilityEventsForOurBabies reset the
state to NormalState since the windows were still above desktop

nemomobile-graveyard/mcompositor,nemomobile-graveyard/mcompositor,nemomobile-graveyard/mcompositor,nemomobile-graveyard/mcompositor,nemomobile-graveyard/mcompositor,nemomobile-graveyard/mcompositor