fix a case where file tracked by git unexpectedly becomes annex pointer file

smudge: When annex.largefiles=anything, files that were already stored in
git, and have not been modified could sometimes be converted to being
stored in the annex. Changes in 7.20191024 made this more of a problem.
This case is now detected and prevented.

Annex/HashObject.hs

@@ -21,7 +21,7 @@ hashObjectHandle :: Annex Git.HashObject.HashObjectHandle
 hashObjectHandle = maybe startup return =<< Annex.getState Annex.hashobjecthandle
   where
 	startup = do
-		h <- inRepo $ Git.HashObject.hashObjectStart
+		h <- inRepo $ Git.HashObject.hashObjectStart True
 		Annex.changeState $ \s -> s { Annex.hashobjecthandle = Just h }
 		return h