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

We can simply use the underlying attribute.

Differential Revision: https://phab.mercurial-scm.org/D11366

mercurial/pure/parsers.py

@@ -268,7 +268,7 b' class DirstateItem(object):'
     @property
     def added(self):
         """True if the file has been added"""
-        return self.v1_state() == b'a'
+        return self._wc_tracked and not (self._p1_tracked or self._p2_tracked)
 
     @property
     def merged(self):