Update comments integration tests to work on latest API
Update comments integration tests to work on latest API

Comment default sort order was changed to be more consistent with other
endpoints (and with WP_Comment_Query), which broke our integration test
because the test was written for the previously-default "asc" ordering.

kadamwhite/wordpress-rest-api,WP-API/node-wpapi,kadamwhite/wordpress-rest-api,kadamwhite/wordpress-rest-api,WP-API/node-wpapi