Adds updated fixtures file.

Author: hannahtinkler

tests/qunit/fixtures/wp-api-generated.js

@@ -10443,7 +10443,6 @@ mockedApiResponse.Schema = {
                             "required": false
                         },
                         "post_details": {
-                            "default": [],
                             "description": "An array of post details.",
                             "type": "array",
                             "required": false