[Tile-serving] [osm2pgsql] modified relation removes existing way and adds it again (#559)

[Sarah Hoffmann]

That's how all updates work: delete the object unconditionally and reinsert it. See for example https://github.com/openstreetmap/osm2pgsql/blob/master/output-pgsql.cpp#L565. It's a simple strategy that avoids a lot of strange edge cases and probably will never change.

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