largefile: use `set_tracked` in the `hg add` overwrite

This is the new shiny API.

Differential Revision: https://phab.mercurial-scm.org/D11104

hgext/largefiles/overrides.py

@@ -150,10 +150,7 b' def addlargefiles(ui, repo, isaddremove,'
                     executable=lfutil.getexecutable(repo.wjoin(f)),
                 )
                 standins.append(standinname)
-                if lfdirstate[f] == b'r':
-                    lfdirstate.normallookup(f)
-                else:
-                    lfdirstate.add(f)
+                lfdirstate.set_tracked(f)
             lfdirstate.write()
             bad += [
                 lfutil.splitstandin(f)