rhg: avoid calculating copies for status --no-status...
rhg: avoid calculating copies for status --no-status
This changes how rhg status avoids printing copies with --no-status.
Originally
668a871454e8 added a check right before printing copies.
This changes it to match Python and check it earlier by defining
`list_copies = ... && !no_status`. This makes no difference now, but
when we implement --rev --rev --copies it will ensure we don't do
wasteful copy tracing when it's not going to be printed.
