Forms: Fixes checkbox checked state for admins

[enejb]

Fixes #14912

Currently when a user adds a checkbox and sets the default state to be "checked" the admin user doesn't see the checked state when logged in when they see the form.

This PR fixes this by removing the (remove value behaviour the default value for admins for the checkbox).

Proposed changes:

Fix the checked default setting for logged in users.

Other information:

• Have you written new tests for your changes, if applicable?
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Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

Load this PR.

1. Create a new page.
2. Add the form block and then add the checkbox block.
3. in the setting for the checkbox block set the default value as checked.
4. Notice now when you preview the form that the checkbox is checked as expected.

[github-actions]

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[edanzer]

Changes look simple and straightforward, and I confirmed both the original issue and the fix.

I'm curious about why we're not showing pre-populated fields for admins in the first place if those fields will be pre-populated for end users. I would have thought admins would want to see the form preview as it will render for end users.

UPDATE: Approving with a note that there seems to be a failing test that needs to be resolved. Looks like the change here is resulting in a type issue on the render_default_field method.