hide window before restoring the client on unmaps
hide window before restoring the client on unmaps

otherwise compositors will update the texture and operate on (fade) the
frame instead of the client.
Didn't test why this only happens on ARGBs, but could be the colormap
installation.

BUG: 1110

luebking/fluxbox,luebking/fluxbox,luebking/fluxbox,Arkq/fluxbox,Arkq/fluxbox,luebking/fluxbox,luebking/fluxbox,Arkq/fluxbox,Arkq/fluxbox,Arkq/fluxbox