Bug 10469: Display more when editing subfields in frameworks

Bug 10469: Display more when editing subfields in frameworks

This patch removes the accordion feature from the MARC subfields
structure editor. The form is not long, and I think in this case the
accordion makes the process more difficult to navigate.

To test, apply the patch and go to Administration -> MARC frameworks ->
Framework structure -> Subfield structure -> Edit. Choose a tag with
multiple subfields to best test the changes.

The whole form should apppear, and tabs functionality should work
correctly. Test that making changes under multiple tabs works correctly.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>