"Create account" button is not available for sign up popup on iPhone

[KostiantynFandeliuk]

Please always provide the GitHub issue(s) your PR is for, as well as test URLs where your change can be observed (before and after):

Fix #

Test URLs:

• Before: https://main--boilerplate-commerce-dropins--hlxsites.hlx.live/
• After: https://fix-modal-view--boilerplate-commerce-dropins--hlxsites.hlx.live/

[aem-code-sync[bot]]

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