[Backport] FIXED - appended payment code to ID field to make it unique

[mage2pratik]

Original Pull Request

#15344

Description

Fixed Issues (if relevant)

1. In payment step of checkout I cannot unselect #billing-save-in-address-book checkbox in non-first payment method #13692: In payment step of checkout I cannot unselect #billing-save-in-address-book checkbox in non-first payment method

Manual testing scenarios

1. Log in to your client account.
2. Add product to cart.
3. Go to checkout and click next button to be able to choose payment methods.
4. Open payment method other than the first one.
5. Uncheck My billing and shipping address are the same checkbox
6. Choose New address on the billing address dropdown
7. Fill address
8. Click on label Save in address book

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.
We will aim to release these changes as part of 2.1.15.
Please check the release notes for final confirmation.