test-dirstate-race: back out changeset c82fa7efcbc8

This is non-deterministic. In any case, I switched to using
debugrebuilddirstate in my WIP patches, which makes this moot.

tests/test-dirstate-race.t

@@ -156,4 +156,4 b' treated differently in _checklookup() ac'
   $ hg files
   a
   $ hg debugdirstate
-  n 644          2 unset               a
+  n * * * a (glob)