[Tile-serving] [osm2pgsql] Use the polygon flag from the tagtransforms to change multi-backend (#471)

[Paul Norman]

> I see 2 failing tests as a result of merging this: test-output-multi-line and test-output-multi-line-storage.

Ya, I was looking at that.

>  The latter now doesn't have any output into the database, so I'm not sure if it is even worth keeping if the output is correct.

It was for #274, where the node cache wasn't being resized correctly. The issue is the transform is now indicating that it's a polygon, which is wrong (and was wrong before)

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