Fix validation rule in SHBrowseForFolder

[Boris Herbinière-Sève]

Hello,

When calling SHBrowseForFolder with both BIF_RETURNONLYFSDIRS and
BIF_BROWSEINCLUDEFILES flags the 'Ok' button is incorrectly disabled when a
file is selected (button is enabled however when a directory is selected).

I'm not familiar with the Wine codebase so I hope this submission is valid.

The full description and a test case is available on bugzilla #15384
http://bugs.winehq.org/show_bug.cgi?id=15384

-- 
Boris Herbinière-Sève
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