Fix 'should have the right args with a new doc' test

[marten-de-vries]

https://github.com/pouchdb/pouchdb-validation/blob/master/test/features.js#L295

This used to pass so probably something changed in PouchDB, but I'm not certain about CouchDB's behaviour here so it's probably best to investigate some more about what needs to change and where to fix it, before actually doing so.