vcs: fix typo in MercurialChangeset.committer

It has apparently never been used and could perhaps just be removed. Especially
because it also seems suspicious that it will do safe_unicode twice.

rhodecode/lib/vcs/backends/hg/changeset.py

@@ -45,7 +45,7 b' class MercurialChangeset(BaseChangeset):'
 
     @LazyProperty
     def commiter(self):
-        return safe_unicode(self.auhtor)
+        return safe_unicode(self.author)
 
     @LazyProperty
     def author(self):