[Tile-serving] [openstreetmap/osm2pgsql] Move declaration of static `db` into tests (#1012)

[Sarah Hoffmann]

The tempdb_t object is intentionally static so that the database is only created once per test run. Also note that the constructor for tempdb_t catches exceptions and exits with an appropriate error message. I admit though that there is still room for improvement in that constructor, e.g. adding noexcept and having an extra catch block for the extension creation that drops the database again.

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