Bug 4927 - OPAC advanced search has two call number entries; remove one?

This patch removes the second Call number entry in OPAC Advanced search with Advanced option (for bootstrap).

To test:
- Go to OPAC, Advanced search, enable Advaced options
- In dropdowns you see two entries "Call number"
- Apply patch
- Verify that the second "Call number" has disappeared (below ISSN)

Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Template change only - no problems found.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>