user32: Add test and fix for the error with edit control whose parent is desktop.

[Ilya Shpigor]

Add test and fix for the error with a edit control. Now if the parent is 
desktop no any messages send to It. In this case the control get the parent 
brush handle through function GetSysColorBrush() directly.

Changelog:
  - user32/edit.c: add checking parent to desktop in EDIT_NotifyCtlColor()
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