comdlg32: No and escape are equivalent (take 2)

[Juan Lang]

Hi, sorry for the noise.  I decided to put two changes in a single
patch rather than sending two, because they're so close to one another
and fix the same behavior in the same function.  This supersedes
http://www.winehq.org/pipermail/wine-patches/2010-June/089201.html
Still fixes bug 23007, http://bugs.winehq.org/show_bug.cgi?id=23007
--Juan
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