Media & Text: Correctly reset the 'useFeaturedImage' attribute

[SH4LIN]

What?

Fixes #68246.

This PR will fix the issue where the useFeaturedImage flag is not reset when other media is selected in the Media Text block.

Why?

• This issue was causing featured image and other selected media displayed on the frontend

How?

• This PR will reset useFeaturedImage to false once any other media is selected

Testing Instructions

1. Add media text block select the useFeaturedImage
2. Check the frontend
3. Select other media for the media text block and check the frontend it shouldn't show double media

Screenshots or screencast

[github-actions]

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Co-authored-by: SH4LIN <sh4lin@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>

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[Mamaduka]

@SH4LIN, please use reserved keywords to link PRs and issues.

It would make it easier for folks to discover your PRs.

[Mamaduka]

Thanks for contributing, @SH4LIN!