rollback: always call destroyed() (regression from 1.9)

The contract for repo.destroyed() is that it is called whenever
changesets are destroyed, either by strip or by rollback. That
contract was inadvertently broken in 7c26ce9edbd2, when we made a
chunk of code conditional on destroying one of the working dir's
parents. Oops: it doesn't matter *which* changesets are destroyed or
what their relationship is to the working dir, we should call
repo.destroyed() whenever we destroy changesets.

mercurial/localrepo.py

@@ -820,7 +820,6 b' class localrepository(repo.repository):'
                         % self.dirstate.branch())
 
             self.dirstate.invalidate()
-            self.destroyed()
             parents = tuple([p.rev() for p in self.parents()])
             if len(parents) > 1:
                 ui.status(_('working directory now based on '
@@ -828,6 +827,7 b' class localrepository(repo.repository):'
             else:
                 ui.status(_('working directory now based on '
                             'revision %d\n') % parents)
+        self.destroyed()
         return 0
 
     def invalidatecaches(self):