wineserver: fix get_update_region for desktop window

[Michael Jung]

Calling SetSysColor in the current cvs version of wine causes an infinite loop 
in update_now in dlls/user/painting.c. As I understand it, the problem is the 
following: get_update_flags will promote it's child window argument to the 
next child window (via a wineserver call to get_update_region), if the 
current child doesn't need any repaint. Calling get_update_flags on the 
desktop window will always return a repaint flag, so it never gets ahead. The 
attached patch automatically promotes the child window argument to the first 
child, if called on the desktop window. I don't know if this really is the 
desired behaviour. Another fix would be to not return any repaint flags for 
the desktop window.

Ciao,
 Michael
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