Bug 36472: Add search box at the top of the authorities editor page

Bug 36472: Add search box at the top of the authorities editor page

This patch adds the authority search header include to the authorities
editor page.

To test, apply the patch and go to Authorities -> New authority.

There should now be a set of authority search forms at the top of the
page.

Signed-off-by: Michelle Spinney <mspinney@clamsnet.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 4b8dad9a8e5c70e4ec5e1d7f29790b6fd4e3796f)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>