largefiles: make prompt order deterministic

42ae1b1f048f introduced iteration of a set. Make it stable.

hgext/largefiles/overrides.py

@@ -470,7 +470,7 b' def overridecalculateupdates(origfn, rep'
         elif lfutil.standin(f) in p1:
             lfiles.add(f)
 
-    for lfile in lfiles:
+    for lfile in sorted(lfiles):
         standin = lfutil.standin(lfile)
         (lm, largs, lmsg) = actions.get(lfile, (None, None, None))
         (sm, sargs, smsg) = actions.get(standin, (None, None, None))