largefiles: restore archiving largefiles with hgweb (issue4859)
This regressed in 7699d3212994, when trying to conditionally disable archiving
of largefiles.
I'm not sure if wrapfunction() is the right way to do this, but it seems to
work. The mysterious issue with lfstatus getting out of sync in the proxy and
the unfiltered view crops up again here. See the referenced cset for more info.