largefile: use `set_clean` instead of `normal` in `lfdirstatestatus`

This is the newer, more semantic API.

Differential Revision: https://phab.mercurial-scm.org/D11156

hgext/largefiles/lfutil.py

@@ -251,7 +251,7 b' def lfdirstatestatus(lfdirstate, repo):'
             modified.append(lfile)
         else:
             clean.append(lfile)
-            lfdirstate.normal(lfile)
+            lfdirstate.set_clean(lfile)
     return s