copies: fix up "fullcopy" with missing entries from "diverge"
Similar to the previous patch, but this doesn't even affect tests. It
does affect tests if you change them to turn on debug logging. I'm
fixing it here so reviewers of the later rewrite patch can hard-code
debug logging to be on and more easily compare test results.
Differential Revision: https://phab.mercurial-scm.org/D6247
To run the tests, do:
cd tests/
python run-tests.py
See https://mercurial-scm.org/wiki/WritingTests for
more information on writing tests.