amp-ad: Relap ad uses sub-optimal way of installation

[advzr]

Description

Relap ad uses an older way of installing itself in <amp-ad> which causes it to load https://relap.io/v7/relap.js twice.

Reproduction Steps

Go to a demo page with a network tab in developer tools

Relevant Logs

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Browser(s) Affected

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OS(s) Affected

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Device(s) Affected

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AMP Version Affected

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