Bug 25801: (follow-up) Add Show all items-link on opac-detail

Bug 25801: (follow-up) Add Show all items-link on opac-detail

As requested by Katrin in QA, it might be helpful to provide a
link to return to the regular view with all items.

The information about acquisition and holds refers to all items,
so I moved it inside the else branch of this block.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>