shlwapi: fix UrlUnEscape inplace behavior (2/2) (try 3)

[Dan Kegel]

Fix UrlUnEscape to expand URLs inplace even if the output buffer is NULL.
Needed by Lively, http://bugs.winehq.org/show_bug.cgi?id=1438

Changes:
1) removes todo_wine around tests it fixes
2) Added original From: line as requested by Alexandre
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