similar: delete extra newline at EOF

Spotted by my emacs config that cleans up extra whitespace.

mercurial/similar.py

@@ -106,4 +106,3 b' def findrenames(repo, added, removed, th'
         for (a, b, score) in _findsimilarmatches(repo,
                 sorted(addedfiles), sorted(removedfiles), threshold):
             yield (a.path(), b.path(), score)
-