Bug 29965: Preview MARC in authority search results

Bug 29965: Preview MARC in authority search results

This enhancement makes the authority MARC preview modal available for
the general authority search results.

To test:
1) Do a catalog search and edit a biblio record
2) Go to one of the authority tags (i.e. 1xx, 6xx, 7xx) and open the
authority finder plugin
3) Do an authority search
4) Click on one of the search result headings to open the modal. Confirm
it opens as expected.
5) Exit the biblio editor and go to Authorities
6) Do an authority search
7) Click on the Actions dropdown, then the MARC preview button,
to open the modal. Confirm it opens as expected.

Sponsored-by: Education Services Australia SCIS
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>