[Tile-serving] [osm2pgsql] Set coding style (#370)

[Paul Norman]

K&R (1TBS variant) then? That's what we ended up using in [avecado](https://github.com/MapQuest/avecado/blob/master/README.md#contributing)

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https://github.com/openstreetmap/osm2pgsql/issues/370#issuecomment-118550069
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