minor: environments allow different types of casing in params

https://api.gbif.org/v2/map/occurrence/adhoc/predicate/ is used for maps
It fails with status 400 bad request when posting
```json
{
  "type": "equals",
  "key": "taxonKey",
  "value": "1"
}
```
but works on UAT. and returns 404 on dev. and fails with 400 on lab

It seems it is just about the casing for taxonKey vs TAXON_KEY. But it would be nice to have the same rule in all environments