Cover Block: Show settings inspector controls in the Site Editor

[pranvinit]

What?

1. The Cover block was not showing the Settings inspector controls in the Site Editor.

Why?

1. Because the url attribute was undefined for featured image (fetched contextually in the post) when editing a template.

How?

1. Extend the condition to show the Settings inspector controls if the user is editing a template.

Testing Instructions

1. Edit a template (e.g., a Single Post template) in the Site Editor.
2. Add a Cover block.
3. Switch the image source to "Use Featured Image" → The Fixed Background option is now available.

Resolves: #69179

Screenshots or screencast

Screen.Recording.2025-02-13.at.2.10.39.PM.mov

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[github-actions]

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