UHF-X accordion state fix & accessibility fix

[rpnykanen]

What was done

• Fixed problem which prevented accordion from working on multiple pages
• Added type attribute to button-html element due to accessibility guidelines

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-X_accordion_state_fix
• Run make drush-cr

How to test

• Open and close accordion items on multiple pages
• Reload the pages after opening and closing accordions
  • Accordion items should open and close on page load
  • No javascript errors on inspector while opening and closing the accordion items after page reload
• Accordion toggle & close buttons have type="button" -attribute