Bug 36659: Show correct tab after conducting an Authorities search

Bug 36659: Show correct tab after conducting an Authorities search

To test:

1. In the staff interface, go to Authorities
2. Do a search for each tab, i.e. 'Main heading' and 'Entire record'
3. Notice every search has the 'Main heading ($a only)' tab selected when the results page loads.

4. Apply patch and restart services

5. Repeat step 2 and confirm the appropriate tab is selected by default after each search.

Sponsored-by: Education Services Australia SCIS
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>