Adjust markup for radio and checkbox fields to match WordPress Core

[claytoncollie]

Description of the Change

Addresses #41 to fix the alignment of checkbox and radio fields in the wp-admin. Radios and checkboxes now follow the same markup as WordPress Core.

Benefits

Accessibility and keyboard usability of the admin pages should be a little cleaner with these changes.

Possible Drawbacks

Breaking the settings fields.

Verification Process

• How did you verify that all new functionality works as expected?

Installed the plugin on a local instance, made my changes and saved each settings field multiple times:

Disable Gutenberg - https://tenup.test/wp-admin/options-writing.php

Enable Password Protection - https://tenup.test/wp-admin/options-writing.php

Enable Support Monitor - https://tenup.test/wp-admin/options-general.php

Production Environment - https://tenup.test/wp-admin/options-general.php

And also for multisite - https://tenup.test/wp-admin/network/settings.php

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.

Changelog Entry

Changed admin markup for Disable Gutenberg, Enable Password Protection, Enable Support Monitor, and Production Environment