[Tile-serving] [osm2pgsql] Allow polygon/linestring decision to be set by value in lua (#346)

[Paul Norman]

changes to `filter_tags_relation_member` should also be mirrored in multi.lua, as they are basically the same function.

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https://github.com/openstreetmap/osm2pgsql/pull/346#issuecomment-97665061
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