[Backport] Remove duplicated CSS selector

[dmytro-ch]

Original Pull Request

#18897

Description (*)

Remove duplicated CSS selector in app/design/frontend/Magento/luma/Magento_Checkout/web/css/source/module/_cart.less.

Fixed Issues (if relevant)

N/A

Manual testing scenarios (*)

1. Verify the items table on shipping cart 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 @dmytro-ch. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

• @magento-engcom-team give me test instance - deploy test instance based on PR changes
• @magento-engcom-team give me $VERSION instance - deploy vanilla Magento instance

For more details, please, review the Magento Contributor Assistant documentation

[sidolov]

@magento-engcom-team give me 2.3-develop instance

[magento-engcom-team]

Hi @sidolov. Thank you for your request. I'm working on Magento 2.3-develop instance for you

[magento-engcom-team]

Hi @sidolov, here is your Magento instance.
Admin access: http://ec2-34-228-235-121.compute-1.amazonaws.com/i-19002-2-3-develop//admin
Login: admin Password: 123123q
Instance will be terminated in up to 3 hours.

[sidolov]

@magento-engcom-team give me 2.2-develop instance

[magento-engcom-team]

Hi @sidolov. Thank you for your request. I'm working on Magento 2.2-develop instance for you

[magento-engcom-team]

Hi @sidolov, here is your Magento instance.
Admin access: http://ec2-34-228-235-121.compute-1.amazonaws.com/i-19002-2-2-develop//admin
Login: admin Password: 123123q
Instance will be terminated in up to 3 hours.

[magento-engcom-team]

Hi @dmytro-ch. Thank you for your contribution.
We will aim to release these changes as part of 2.2.8.
Please check the release notes for final confirmation.

Please, consider to port this solution to 2.3 release line.
You may use Porting tool to port commits automatically.