Bug 30549: Replace the use of jQueryUI Accordion on pending patron updates page

Bug 30549: Replace the use of jQueryUI Accordion on pending patron updates page

This patch updates the pending patron updates page to use Bootstrap
collapse instead of jQueryUI.

This patch contains whitespace changes, so view the diff with this in
mind.

To test, apply the patch and rebuild the staff client CSS
(https://wiki.koha-community.org/wiki/Working_with_SCSS_in_the_OPAC_and_staff_client).

- If necessary, log into the OPAC and submit an update via the "Your
  personal details" page. Ideally do this for two or more patrons.
- In the staff client, follow the "Patrons requesting modifications"
  link.
- On the "Update patron records" page you should see the headings
  representing each of the patrons with pending updates. The first panel
  should be expanded.
- Confirm that the panels expand and collapse correctly.
- Follow the "Patron details" link for one of these patrons.
- Click the "Review pending modifications" link on the patron detail
  page.
- When the update page opens that patron's panel should be expanded.

Signed-off-by: Lisette Scheer <lisetteslatah@gmail.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>