shell32/unixfolder: Fix a cloned PIDL leak (Valgrind)

[Nikolay Sivov]

Leak was introduced with 
http://source.winehq.org/git/wine.git/?a=commit;h=193a80a7 (early exit 
after cloning PIDL).

I don't see a point to clone in a first place, cause all we need is to 
keep initial PIDL position unchanged before advance ILGetNext().
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