[Backport] Fixed invalid knockoutjs data binding for Braintree PayPal

[mage2pratik]

Original Pull Request

#17067

Description

These changes fix the broken knockoutjs data binding introduced in #16769 for Braintree PayPal.

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @mage2pratik. Thank you for your contribution
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Add the comment under your pull request to deploy test or vanilla Magento instance:

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[sidolov]

Hi @mage2pratik , current issue was fixed by Magento core team and will be delivered soon. I'm closing this PR as not relevant.