Bug 34931: Remove fieldset/legend in favor of div/h3

Bug 34931: Remove fieldset/legend in favor of div/h3

1. Create some PA_CLASS authorized values.
2. Create some custom patron attributes and add them to the newly created PA_CLASS's.
3.  Set CollapseFieldsPatronAddForm to collapse 'Additional attributes and identifiers'.
4. Go to a new or existing patron record.
5. At the top of the page click the checkbox for "Show collapsed fields:".
6. Scroll down to that section and notice the PA_CLASS <legend> element is shown but not the individual patron attributes within that PA_CLASS.
7. Apply patch
8. Try again, the Additional attributes and identifiers fieldset should display properly.

Signed-off-by: Brendan Lawlor <blawlor@clamsnet.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 1944c66fc03e0e661745ece4bbc04e0607dd6def)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>