[Tile-serving] [osm2pgsql] Set polygon/linestring differently for some key values differently than the key in default style.lua (#346)

[math1985]

@pnorman Would you be able to review this PR? Let me know if you need anything else.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/346#issuecomment-190759518
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