Bug 35743: Fix patron's category selection in the column filter

Bug 35743: Fix patron's category selection in the column filter

The "category" filter is not selected in the column filter dropdown.

Test plan:
0. Do not apply this patch
1. Search for patron, select a patron's category
   => Notice that the "Category" column has a column filter, but no
      option is selected
2. Apply the patch
3. Repeat 1
   => The "Category" column has the option you selected in the filter
      block.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>