dirstate-item: implement `tracked` in a simpler way

We can simply use the underlying attribute.

Differential Revision: https://phab.mercurial-scm.org/D11365

mercurial/pure/parsers.py

@@ -263,7 +263,7 b' class DirstateItem(object):'
     @property
     def tracked(self):
         """True is the file is tracked in the working copy"""
-        return self.v1_state() in b"nma"
+        return self._wc_tracked
 
     @property
     def added(self):