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

tests/test-narrow-debugrebuilddirstate.t

@@ -1,31 +1,31 b''
   $ . "$TESTDIR/narrow-library.sh"
   $ hg init master
   $ cd master
   $ echo treemanifest >> .hg/requires
   $ echo 'contents of file' > file
   $ mkdir foo
   $ echo 'contents of foo/bar' > foo/bar
   $ hg ci -Am 'some change'
   adding file
   adding foo/bar
 
   $ cd ..
   $ hg clone --narrow ssh://user@dummy/master copy --include=foo
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
   new changesets * (glob)
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd copy
 
-  $ hg debugdirstate
-  n *         20 unset               foo/bar (glob)
+  $ hg debugdirstate --no-dates
+  n *         20 *               foo/bar (glob)
   $ mv .hg/dirstate .hg/old_dirstate
   $ dd bs=40 count=1 if=.hg/old_dirstate of=.hg/dirstate 2>/dev/null
   $ hg debugdirstate
   $ hg debugrebuilddirstate
   $ hg debugdirstate
   n *         * unset               foo/bar (glob)