workingctx: remove unneeded __repr__ since it is now inherited

mercurial/context.py

@@ -865,9 +865,6 b' class workingctx(basectx):'
     def __str__(self):
         return str(self._parents[0]) + "+"
 
-    def __repr__(self):
-        return "<workingctx %s>" % str(self)
-
     def __nonzero__(self):
         return True