[Tile-serving] [openstreetmap/osm2pgsql] Output warnings in Latitude/Longtitude, not WebMercator (#838)

[mmd]

I'm not exactly sure where this notice is being triggered. Could this possibly originate in GEOS and triggered by ST_IsValid?

Maybe https://postgis.net/docs/ST_IsValidDetail.html could be useful here to get a bit more structured information ("_Useful to substitute and improve the combination of ST_IsValid and ST_IsValidReason to generate a detailed report of invalid geometries._").

```
 gid  |      reason       |  location
------+-------------------+-------------
 5330 | Self-intersection | POINT(32 5)
 5340 | Self-intersection | POINT(42 5)
 5350 | Self-intersection | POINT(52 5)
```

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