Bug 13335 - Holds and priority display via OPACShowHoldQueueDetails confusing

Bug 13335 - Holds and priority display via OPACShowHoldQueueDetails confusing

No matter what the selection of OPACShowHoldQueueDetails is, if it is
enabled it displays a line "Holds and priority:" even if you've opted to
hide one of those!

Test Plan:
1) Apply this patch
2) Test each setting of OPACShowHoldQueueDetails
3) Ensure each setting displays the correct fields ( or lack thereof )

Signed-off-by: Christopher Brannon <cbrannon@debian.localdomain>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>