context: use `dirstate.set_tracked` for `revert`

This is the new shiny API.

Differential Revision: https://phab.mercurial-scm.org/D11016

mercurial/cmdutil.py

@@ -3686,7 +3686,7 b' def _performrevert('
         if f not in newlyaddedandmodifiedfiles:
             prntstatusmsg(b'add', f)
             checkout(f)
-            repo.dirstate.add(f)
+            repo.dirstate.set_tracked(f)
 
     normal = repo.dirstate.normallookup
     if node == parent and p2 == repo.nullid: