Minor fix to "invalidate" desktop child window instead of the parent window.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/branches/merge-with-vnc-4.1.1@555 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/vncviewer/DesktopWindow.cxx b/vncviewer/DesktopWindow.cxx
index f536e0c..acddf45 100644
--- a/vncviewer/DesktopWindow.cxx
+++ b/vncviewer/DesktopWindow.cxx
@@ -866,7 +866,7 @@
   buffer->setPF(pf);
   
   // Redraw the window
-  InvalidateRect(handle, 0, 0);
+  InvalidateRect(frameHandle, 0, FALSE);
 }
 
 void