user32: dialog16: Add DDL_EXCLUSIVE flag only when flagset equals DDL_DRIVES, not merely when it contains the flag

[Alex Villací­s Lasso]

http://bugs.winehq.org/show_bug.cgi?id=18734

I have noticed that DlgDirList() will not list files indicated by the 
filter when the flags DDL_DRIVES|DDL_DIRECTORY are specified together 
for a 16-bit app. The same app displays the files correctly in Windows 
98. Here is a tentative patch that fixes the problem for me, but I would 
like to receive confirmation that this fixes the issue in the correct 
place, as well as confirmation that this works the same in other Windows 
versions (I have tested WinXP SP2 with identical results). A test 
application that demonstrates the bug, as well as a screenshot that 
displays the bug, have been posted at the referenced bug report.

Changelog:
* Add DDL_EXCLUSIVE flag only when flagset equals DDL_DRIVES, not merely 
when it contains the flag.

-- 
perl -e '$x=2.3;printf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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