[Backport] Fixed apply discount button alignment on checkout page

[amol2jcommerce]

Original Pull Request

#20144

iessue fixed #20137 On checkout page apply discount button is not align with input box

Description (*)

On checkout page apply discount button is not align with input box

Manual testing scenarios (*)

1. add product to cart
2. and go to checkout page

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 @amol2jcommerce. Thank you for your contribution
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[torhoehn]

@magento-engcom-team give me test instance

[magento-engcom-team]

Hi @torhoehn. Thank you for your request. I'm working on Magento instance for you

[torhoehn]

@magento-engcom-team give me test instance

[magento-engcom-team]

Hi @torhoehn. Thank you for your request. I'm working on Magento instance for you

[magento-engcom-team]

Hi @torhoehn, here is your new Magento instance.
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[magento-engcom-team]

Hi @torhoehn, thank you for the review.
ENGCOM-4090 has been created to process this Pull Request

[ghost]

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