[Tile-serving] [osm2pgsql] Fix whitespace errors in geometry-build.cpp (#368)

[Paul Norman]

> Should we also agree on using either 2 or 4 spaces for indention?

Yes. I was going for 4, since that's what most of the file was. We also should set out if the `{` goes on a newline, etc. Because we're mixing so many styles already, we have complete freedom to set something new, since it won't match a good portion of the code no matter *what* it is.

> This pull request is mixing them.

I had intended for 4sp. Could you add a line comment where I missed it?


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