kernel32: Tiny improvement to the GetVolumePathNameW stub

[Louis. Lenders]

Hi,  this fixes Adobe Lightroom 2.0 start up bug, mentioned in 
http://bugs.winehq.org/show_bug.cgi?id=8224#c4

as long wine doesn't handle with volume mount points, it's probably safe to satisfy most apps.

(A simple google for 
"fixme:volume:GetVolumePathNameW"
revealed only about 3 apps , and "fixme:volume:GetVolumePathNameA" revealed zero hits, so for now the use of this api seems not really wide-spread, and no need to touch GetVolumePathNameA i guess)


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