Bug 5502 - Patron card category search field should be menu

Bug 5502 - Patron card category search field should be menu

When searching for patrons to add to a patron card creator batch there
is a text input field for submitting a patron category. This should be a
dropdown menu. This patch corrects it.

To test, go to Tools -> Patron card creator and click "New batch."
 - Click the "Add item(s)" button.
 - Confirm that in the Patron search pop-up window there is a dropdown
   menu populated with existing patron categories.
 - Confirm that searches limited by patron category return correct
   results.
 - Confirm that the correct patron category is automatically preselected
   after performing a search limited by category.
 - Confirm that reordering the table of search results works correctly.

Signed-off-by: Aleisha <aleishaamohia@hotmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>