[user] Fix W/A/16 cross call post-processing for dialog procedures

[Troy Rollo]

Problem previously discussed:
    <http://www.winehq.org/pipermail/wine-devel/2005-October/041053.html>
One symptom is that applications may get an empty string when calling 
GetWindowText to retrieve the title of a dialog box, which will affect, for 
example, tabbed dialog labels in some applications.

ChangeLog
	Ensure that post-processing of message results from dialog procedures
	in W/A/16 cross-calls uses the DWLP_MESSAGERESULT value for the
	LRESULT of the message rather than the return value of the dialog
	procedure (which is an unrelated BOOL).

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