Fix footer validation and spacing issue

[richtabor]

Resolve the block validation issue within the Assembler's footer template part.

Content generated by `save` function:

<h2 class="wp-block-heading has-text-align-center">Hours</h2>

Content retrieved from post body:

<h3 class="wp-block-heading has-text-align-center">Hours</h3>

Before

After

[github-actions]

Preview changes

I've detected changes to the following themes in this PR: Assembler.
You can preview these changes by following the links below:

• Preview changes for Assembler

I will update this comment with the latest preview links as you push more changes to this PR.
⚠️ Note: The preview sites are created using WordPress Playground. You can add content, edit settings, and test the themes as you would on a real site, but please note that changes are not saved between sessions.

[github-actions]

Theme-Check results

assembler: No changes required ✅.

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[alaczek]

👍 LGTM