Bug 37069: OPAC authorities search is stateless

Bug 37069: OPAC authorities search is stateless

This patch removes cud- from the search op and chanegs the form
submission to GET

To test:
1 - Search authorities on OPAC for 'a'
2 - Click page 2
3 - You get the search form
4 - Apply patch, restart all
5 - Repeat search, confirm it works
6 - Click page 2
7 - Confirm you get next results

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Emily Lamancusa <emily.lamancusa@montgomerycountymd.gov>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>