[Ui] Fixing the changing state of dropdown's icon

[eduard13]

Description (*)

This PR fixes the state changing of the dropdown items, and a small styling issue related to the dropdown options.

Fixed Issues (if relevant)

1. [UI] The dropdown state doesn't change if the dropdown is expanded or not #21196: [UI] The dropdown state doesn't change if the dropdown is expanded or not
2. ...

Manual testing scenarios (*)

1. Check task's steps

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]

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[sdzhepa]

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[magento-engcom-team]

Hi @VladimirZaets, thank you for the review.
ENGCOM-4270 has been created to process this Pull Request

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[sdzhepa]

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

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