Bug 9147: OPAC hidden fields are not hidden in ISBD view

Bug 9147: OPAC hidden fields are not hidden in ISBD view

When in framework a subfield has a number > 0 in hidden, it his hidden in MARCview.
It should be hidden also in ISBD view.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Does what it says, hides hidden fields on the OPAC

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
All tests and QA script pass.

To test:
1) Hide 245$b or another field from ISBD view in your MARC
   framework by assigning a hidden value greater 0
2) Check the different views in OPAC, the field should be hidden now from
  - Labelled MARC view (as it was before this patch)
  - ISBD view
   It will still show up for plain MARC and XSLT views.
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>