Bug 31848: Correct margin and padding on action fieldset in aside

Bug 31848: Correct margin and padding on action fieldset in aside

This patch makes a minor modification to the padding and margin of
<fieldset class="action"> nested in a .brief fieldset. This markup is
seen most often in sidebar filter form. The change allows the submit
button to line up better with other form fields.

The patch also corrects and inconsistency by modifying the holds queue
template so that the .action fieldset is inside the .brief fieldset.

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

- If necessary, place one or more holds for pickup at your logged-in
  library and rebuild the holds queue
  (misc/cronjobs/holds/build_holds_queue.pl)
- Go to Circulation -> Holds queue.
- The form should look correct.
- Submit the form and check the form in the sidebar. It should look
  correct as well, with the submit button aligned left with the other
  form fields.
- Check pages with similar sidebar forms, e.g.:
  - Administration -> Budgets -> Funds -> Planning
  - Circulation -> Overdues
  - Circulation -> Holds to pull
  - Acquisitions -> Invoices -> Search results

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>