Fix broken image URL in TV demo

[MGaetan89]

Pull request

Description

One of the image URL was broken in the TV demo app. This PR updates the URL to use the correct one.
Fix coming from SRGSSR/pillarbox-apple#771 by @waliid

Changes made

• Self-explanatory

Checklist

• Your branch has been rebased onto the main branch.
• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).
• All pull request status checks pass.

[github-actions]

Code Coverage

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