largefiles: stop using <> operator in favor of !=

<> has been deprecated for a while, and != is futureproof

hgext/largefiles/reposetup.py

@@ -355,7 +355,7 b' def reposetup(ui, repo):'
                 lfdirstate = lfutil.openlfdirstate(ui, self)
                 for standin in standins:
                     lfile = lfutil.splitstandin(standin)
-                    if lfdirstate[lfile] <> 'r':
+                    if lfdirstate[lfile] != 'r':
                         lfutil.updatestandin(self, standin)
                         lfdirstate.normal(lfile)
                     else: