test: restore expected output in test-persistent-nodemap.t
The merge
78cafd48b9b2 had a small error and wrongly dropped the output updated
from one side of the merge.
This changeset re-install it.
Differential Revision: https://phab.mercurial-scm.org/D8678
heptapod-ci: build rhg before tests run
Differential Revision: https://phab.mercurial-scm.org/D8682