smartset: fix default value of abstractsmartset.sort()

It's unused, but it shouldn't lie.

mercurial/smartset.py

@@ -117,7 +117,7 b' class abstractsmartset(object):'
         """reverse the expected iteration order"""
         raise NotImplementedError()
 
-    def sort(self, reverse=True):
+    def sort(self, reverse=False):
         """get the set to iterate in an ascending or descending order"""
         raise NotImplementedError()