Fix typo in CORS header.
Fix typo in CORS header.

Thanks to Anthony Ramine for the heads up at

    https://github.com/apache/couchdb/commit/b90e40212663474e873fde6cab343c31c1e635e7#commitcomment-2355206

alanning/couchdb-couch,KlausTrainer/couchdb-couch,smithsz/couchdb-couch,fkaempfer/couchdb,cloudant/couchdb-couch,fkaempfer/couchdb,alanning/couchdb-couch,KlausTrainer/couchdb-couch,smithsz/couchdb-couch,cloudant/couchdb-couch,apache/couchdb-couch,smithsz/couchdb-couch,fkaempfer/couchdb,apache/couchdb-couch,apache/couchdb-couch,fkaempfer/couchdb,alanning/couchdb-couch,KlausTrainer/couchdb-couch,ngpestelos/couchdb-couch,ngpestelos/couchdb-couch,fkaempfer/couchdb,cloudant/couchdb-couch,fkaempfer/couchdb,ngpestelos/couchdb-couch