dirstate-item: use `tracked` instead of the `state` in context's iter

Differential Revision: https://phab.mercurial-scm.org/D11531

mercurial/context.py

@@ -1551,7 +1551,7 b' class workingctx(committablectx):'
     def __iter__(self):
         d = self._repo.dirstate
         for f in d:
-            if d[f] != b'r':
+            if d.get_entry(f).tracked:
                 yield f
 
     def __contains__(self, key):