dirstate: use `reset_state` instead of `dropfile` in largefile

As `dirstatemap.dropfile` is on its way out.

Differential Revision: https://phab.mercurial-scm.org/D11441

hgext/largefiles/lfcommands.py

@@ -577,7 +577,7 b' def updatelfiles('
                 repo.wvfs.unlinkpath(lfutil.standin(f))
                 # This needs to happen for dropped files, otherwise they stay in
                 # the M state.
-                lfdirstate._map.dropfile(f)
+                lfdirstate._map.reset_state(f)
 
             statuswriter(_(b'getting changed largefiles\n'))
             cachelfiles(ui, repo, None, lfiles)