Fix isAccessAllowed default

[emmatown]

To test this, you can put this into an example, run it and see that you can access the Admin UI.

import { config, createSchema, list } from '@keystone-next/keystone/schema';
import { text, checkbox } from '@keystone-next/fields';

export default config({
  db: {
    adapter: 'mongoose',
    url: 'mongodb://localhost/keystone-basic-todo',
  },
  lists: createSchema({
    Todo: list({
      fields: {
        title: text({ isRequired: true }),
        isComplete: checkbox(),
      },
    }),
  }),
});

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[changeset-bot]

🦋 Changeset detected

Latest commit: f8405e2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 13 packages

Name	Type
@keystone-next/admin-ui	Major
@keystone-next/keystone	Major
@keystone-next/example-auth	Patch
@keystone-next/app-basic	Patch
@keystone-next/example-ecommerce	Patch
@keystone-next/example-roles	Patch
@keystone-next/example-todo	Patch
@keystone-next/auth	Major
@keystone-next/cloudinary	Patch
@keystone-next/fields-document	Patch
@keystone-next/fields	Patch
@keystonejs/test-utils	Patch
@keystonejs/benchmarks	Patch

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[emmatown]

I've made this a major for both packages because it's changing access so just in case someone is relying on the current default of not having a session meaning they're not allowed access to the Admin UI, it won't suddenly change in a patch

[timleslie]

Tested the example and was able to access the Admin UI 👍