Bug 21880: "Relationship information" disappears when accessing paginated results...

Bug 21880: "Relationship information" disappears when accessing paginated results in authority searches

When linking authorities with authorities, if you perform a
search that returns >20 results, the "Relationship information"
section disappears when you click on the pagination hyperlinks.

This patch fixes that.

Test plan:
1) In the Authorities module, edit an authority (or create a new
   one) and try to link it with another authority (via UNIMARC
   500$a, for example).
2) When the authority finder comes up, search for something that
   will yield more than 20 results, then click on the pagination
   links -- notice how the "Relationship information" section is
   no longer visible.
3) Apply the patch (and restart Plack/memcached, if necessary).
4) Repeat step 2) -- "Relationship information" is now persistent.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 8bf032f512687cfe7ddc3748675c54f18b08c010)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>