[Tile-serving] [openstreetmap/osm2pgsql] z_order values differing between default lua file and C code? (#913)

[Sarah Hoffmann]

The Lua style, serves just as an example. It is currently written in a way that it provides output that is very similar to the C transform but we don't give guarantees that it is exactly the same outcome. 

I'm not sure why the  `z_order` differs, maybe @pnorman remembers but I'm not sure it is a good idea to adapt either of them now as likely a lot of installations depend on the default styles, both for C and Lua transforms.

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