Bug 13574: Fix display of repeatable item subfields

Bug 13574: Fix display of repeatable item subfields

Applies to OPAC and staff: opac-MARCdetail and catalogue/MARCdetail.

Test plan:
[1] Pick an item. Pick two fields say URI and copy number, and fill these
with a value like A | B. (The pipe char is important.)
[2] Verify that the display of the item block on opac-MARCdetail shows
both A and B in those columns. (Previously only B was shown.)
[3] Verify the same on catalogue MARC detail, items tab.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Holly Cooper <hc@interleaf.ie>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>