Bug 11158: Add complete field to authority "starts with" search

Bug 11158: Add complete field to authority "starts with" search

This patch adds "complete field" to the authority "starts with"
search so that it uses the untokenized "p" register.

Test plan:
1. Apply the patch
2. koha-plack --restart kohadev
3. Go to http://localhost:8081/cgi-bin/koha/authorities/authorities-home.pl
4. Type in "Espen" into the search box and hit "Submit"
5. Note that there are 3 results
6. Change "contains" to "starts with" and hit "Submit"
7. Note that no results are returned
8. Change the search from "Espen" to "Sandberg" and hit "Submit"
9. Note that 3 results are returned
10. Experiment to your heart's content and rejoice at your new found power

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>