largefiles status: update lfdirstate with result from cleanliness check

Problem: 'hg status' kept checking largefiles with an unknown state until some
other command wrote the updated dirstate.

Solution: Add missing lfdirstate.write().

hgext/largefiles/reposetup.py

@@ -269,6 +269,8 b' def reposetup(ui, repo):'
                         return f
                     result = [[toname(f) for f in items] for items in result]
 
+                lfdirstate.write()
+
                 if not listunknown:
                     result[4] = []
                 if not listignored: