Set the default as applicatoin/vnd.api+json

I currently have an issue when I just open the list views (for devices for example) in Chrome. It complains then:

{"errors":[{"detail":"This endpoint only provides the following content types: application/vnd.api+json, application/json, >text/html, text/csv","status":"406","title":"Bad request"}],"jsonapi":{"version":"1.0"}}

Maybe we can set the default as applicatoin/vnd.api+json if nothing is given at all.

https://gitlab.hzdr.de/hub-terra/sms/backend/-/merge_requests/287#note_1373468