morestatus: don't crash with different drive letters for repo.root and CWD
Previously, if there were unresolved files and the CWD drive was different from
the repo drive, `hg status -v` would page the normal status, followed by the
exception header. A stacktrace was waiting when the pager exited. The
underlying cause was the same as f445b10dc7fb.
Unfortunately, I don't see any reasonable way to write a test this [1].
[1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-November/107401.html
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