UHF-9357: Remove HDS-dropdown quickfix now that it has been fixed in HDS

[teroelonen]

UHF-9357

What was done

• Removed HDS-dropdown quickfix now that it has been fixed in HDS

How to install

• Make sure your instance is up and running on latest dev branch.
  • git pull origin dev
  • make fresh
• Update the HDBT theme
  • composer require drupal/hdbt:dev-UHF-9357
• Run make drush-cr

How to test

• You need to check React filter searches with dropdowns. The thing to check is that the dropdown button with class such as Select-module_button__* Select-module_placeholder__* now doesn't have the background-color: inherit; set from our css anymore but instead on the styles coming from the React-component. You can for example compare the production and local versions of the button css and you should see the difference.
• Check that code follows our standards.

Continuous documentation

• This feature has been documented/the documentation has been updated
• This change doesn't require updates to the documentation

[github-actions]

⚠️ Visual regression found! Please check if this change is wanted or accidental. You can check the output here: https://city-of-helsinki.github.io/drupal-hdbt-visual-regression/pull/1156/html_report/

[annadruid]

Looks good!