Fixed syntax for before-after operators in less files.

[sanganinamrata]

Description

Fixed syntax for before-after operators in less files.

Fixed Issues (if relevant)

N/A

Manual testing scenarios

N/A

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 @namratachangani. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
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[magento-engcom-team]

Hi @miguelbalparda, thank you for the review.
ENGCOM-2016 has been created to process this Pull Request

[orlangur]

Please always create new branch out of 2.2-develop. Currently this branch is containing change from your other PR. I'll close it.

[magento-engcom-team]

Hi @orlangur, thank you for the review.
ENGCOM-2016 has been created to process this Pull Request

[sanganinamrata]

@orlangur Hello,

Ok, I'll create a new branch out of 2.2-develop from now onwards.

[magento-engcom-team]

Hi @namratachangani. Thank you for your contribution.
Changes from your Pull Request will be available with the upcoming 2.2.6 release.

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