Post Terms: Removing wp_kses_post causing issue

[shimotmk]

What?

Fixes: #68742
Follow up: #68810

#68810 has not seen any activity for several months, so I will follow up and resolve the issues.

Why?

The bg color of the prefix and suffix format is different from the normal display.

How?

Removing wp_kses_post which causing the issue.

As mentioned in this #40803

This probably isn't really necessary, but for consistency with the other blocks that have RichText fields and server-render those fields, I thought we could add it in. (Happy to close this out if folks think it doesn't need it).

Testing Instructions

1. Open a post or page.
2. Insert a Post Terms block.
3. Set the Prefix to a Color from the toolbar.
4. When you look at the front you can see that the Background is not being rendered.

Testing Instructions for Keyboard

Screenshots or screencast

Before	After

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[t-hamano]

Thanks for the PR!

Removing the wp_kses_post function may solve the symptoms, but the underlying problem remains. Let's solve the problem with the wp_kses_post function itself.

See #68742 (comment) for more details.