Fixed incorrect datepicker icon position in admin panel

[rogyar]

Description (*)

The datepicker icons position in the admin panel is incorrect after porting a fix that is not actual for Magento 2.2+ (#16776).

As result, we have the following position instead of the correct one:

This PR fixes the icons position

Fixed Issues (if relevant)

1. Calendar Icon is displaced at the Backend #18605 : Calendar Icon is displaced at the Backend

Manual testing scenarios (*)

1. Login to the admin panel
2. Create a new product or edit an existing one
3. Check the "Set Product as New From" attribute

The icons possition should be correct

(Thank you @larsroettig for providing the detailed information)

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 @rogyar. 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

[larsroettig]

@magento-engcom-team give me test instance

[magento-engcom-team]

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

[magento-engcom-team]

Hi @larsroettig, here is your new Magento instance.
Admin access: http://ec2-34-228-235-121.compute-1.amazonaws.com/pr-18627//admin
Login: admin Password: 123123q

[magento-engcom-team]

Hi @larsroettig, thank you for the review.
ENGCOM-3209 has been created to process this Pull Request

[magento-engcom-team]

Hi @rogyar. Thank you for your contribution.
We will aim to release these changes as part of 2.3.1.
Please check the release notes for final confirmation.

[Ctucker9233]

@magento-engcom-team Is there a backport for 2.2? I see the same behavior.