Bug 19108 - Follow-up - fieldmapping.tt and items_search_fields.tt

Bug 19108 - Follow-up - fieldmapping.tt and items_search_fields.tt

To test:
- Add a framework with script in the description
- Access the Keywords to MARC mapping page
- Add an item search field where both name and label are script
- Try to edit/delete the added mapping

With the patch no script should be executed and everything
should still work ok.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 1649be1e9f510543f85b9e3a22af88ae8c6bfb9c)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 845ee9282472f9a309b3af4aff49403b93091b19)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>