[Tile-serving] [osm2pgsql] Make style.lua code nicer (#53)

[apmon]

Thanks for the suggestion. I have cleaned up the style.lua which is in the repository a bit according to this.

I think this might have made processing slower though (~10%). I haven't really done many benchmarks though.

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https://github.com/openstreetmap/osm2pgsql/issues/53#issuecomment-21318874
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