shell32: fix SHFileOperation copying to an empty file list

[Vincent Povirk]

On Windows, copying files to an empty file list copies each file to
the working directory, truncating each filename to 8.3 format. See bug
13394.

I'm not very happy about the way I implemented this (a special loop
just for the weird case), but it doesn't seem possible to use the
current copy_files loop. This is too different from what the function
does in every other possible situation.

-- 
Vincent Povirk
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