Bug 36379: Fix auth_finder.pl to not expect the op cud-do_search

Bug 36379: Fix auth_finder.pl to not expect the op cud-do_search

The authority finder just does a GET for a list of search results, it
doesn't create or update or delete, so the template that thinks the op
is do_search is correct.

Test plan:
1. Cataloging - New record
2. In the 1 tab click the Tag editor icon at the end of 100 subfield a
3. In the popup, click Search, and nothing happens, no results are shown.
4. Apply patch, reset_all
5. Repeat steps 1-3, see that you get results.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>