Handle cover image URL in partials when image is a resource

[LordGaav]

What does this PR change? What problem does it solve?

I noticed that the image URLs for cover images were not properly generated when the cover image is a reference to a page resource. Google Search Console notified me of this issue.

The logic was taken from the cover.html partial.

I've double checked the images work properly now using this site .

Was the change discussed in an issue or in the Discussions before?

No

PR Checklist

• [ ] This change adds/updates translations and I have used the template present here.
• [X] I have enabled maintainer edits for this PR.
• [X] I have verified that the code works as described/as intended.
• [ ] This change adds a Social Icon which has a permissive license to use it.
• [X] This change does not include any CDN resources/links.
• [X] This change does not include any unrelated scripts such as bash and python scripts.
• [ ] This change updates the overridden internal templates from HUGO's repository.

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