tests: de-flake test-narrow-debugrebuilddirstate.t If the dirstate gets written much later (usually 1-2 s, depending on FS) than the working copy file (there's only one), then the `hg debugdirstate` command will include a timestamp. There's nothing wrong with that, so we should just allow it. Differential Revision: https://phab.mercurial-scm.org/D4758