This commit polishes the previous change, ensuring that if the request
uses a wildcard subtype with an ndjson suffix then the wildcard isn't
present in the response's Content-Type.
Insteand, in that case we would fall back to `applicatin/x-ndjson` (the
base ndjson media type), assuming that the requester is only interested
in the ndjson nature of the underlying representation and not in the
specific semantics of any subtype.
See commit 9332b3f
See gh-26817
3f14ebc4cf