Bug 11794 - restore functioning of opacSerialDefaultTab

The opacSerialDefaultTab system preference should control whether to
show the holdings or subscriptions tab by default on the detail page for
a serial. This behavior was broken when we last updated jQueryUI because
of a change in the jQueryUI active tab class name.

This patch corrects the class on the detail page and removes the old
class from the authorities detail page (where it was unnecessary
anyway).

To test, view a serial record in the OPAC under various settings of the
opacSerialDefaultTab preference. The default tab should correctly follow
the preference.

Test in prog and Bootstrap themes.

Edit: Rebased on current master. Note that the change to
opac-auth-detail.tt is because the page never has more than one tab,
hence doesn't need the "active" designation.

Signed-off-by: Jesse Maseto <jesse@bywatersolutions.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Tested in prog and bootstrap.
All tests and QA script pass.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 15ad3061b2fb11df6ecf5601d5b7d49d7792ba9f)

Conflicts:
	koha-tmpl/opac-tmpl/prog/en/modules/opac-detail.tt