merge: remove obsolete check for untracked files in 'dm' action

Since 0776a6cababe (merge: don't use unknown(), 2012-02-09), untracked
files are no longer included in the manifest diff, so there is no need
to check exclude them when renaming files for directory moves with the
'dm' action.

mercurial/merge.py

@@ -896,9 +896,6 def recordupdates(repo, actions, branchm
     # directory rename, move local
     for f, args, msg in actions['dm']:
         f0, flag = args
-        if f0 not in repo.dirstate:
-            # untracked file moved
-            continue
         if branchmerge:
             repo.dirstate.add(f)
             repo.dirstate.remove(f0)