fix: cards fail if the text contains an icon

[Buuhuu]

Since icons :icon-name: are rendered as <span class="icon icon-icon-name"></span> and decorated with <span class="icon icon-icon-name"><img ...></span> now, querying all <img> in the list of cards and assuming they all have a closest <picture> is wrong. It will fail for the icon <img> and the cards block will be broken.

With this change I limit the selector to <img> that actually have a <picture> parent.

Test URLs:

• Before: https://main--aem-boilerplate--adobe.hlx.live/
• After: https://fix-cards-text-with-icon--aem-boilerplate--buuhuu.hlx.live/

[aem-code-sync]

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