[Tile-serving] [openstreetmap/osm2pgsql] Potential memory leak when running without flatnode option (#931)

[Paul Norman]

> An osm2pgsql run with --number-processes 16 can cause memory usage of `shared_buffers` + `maintenance_work_mem` + 16 * `work_mem` on PostgreSQL's side alone

Not for large values of work_mem. The queries which take a lot of memory are limited to the indexing phase, which doesn't have 16 queries to run, and at half an hour in, we're looking at processing nodes or processing ways.

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