[Tile-serving] [openstreetmap/osm2pgsql] Can't use multipolygon as column type using flex (#1313)

[Jochen Topf]

The problem ist that, despite their name in OSM, multipolygon relations can still create polygon geometries. If `multi` is set to true, it only means that multipolygon geometries are not split, it doesn't mean non-multi polygons are output as multi-polygons. So this means you will have polygons and multipolygons in that column and you need to set the column type to `geometry`:

```
{ column = 'geom', type = 'geometry' }
```

The documentation is misleading and maybe even wrong there and I will correct that.

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