largefiles: remove unused 'rev' parameter from downloadlfiles() It's no longer used since 83ead8cb0ff2 "largefiles: implement pull --all-largefiles as a special case of --lfrev."

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Greg Ward, author of the original bfiles extension

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Na'Tosha Bard of Unity Technologies

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Fog Creek Software

     4

Special thanks to the University of Toronto and the UCOSP program