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phabricator: make `hg phabupdate` work outside of a repository

Authored by mharbison72.

Description

phabricator: make hg phabupdate work outside of a repository

This is similar to 16312ea45a8b- we don't need a repo, but will load .hg/hgrc if
inside one.

Differential Revision: https://phab.mercurial-scm.org/D8208

Details