Bug 35756: Correctly serialize patron's data in patron search popup/modal

Bug 35756: Correctly serialize patron's data in patron search popup/modal

We are incorrectly using encodeURIComponent in patron-search.inc.
When a new patron is selected, the info message is showing "Patron %s is already in the list"
or "Patron %s added". If the patron has space in their name, they will be substituted with %20.

We are using JSON for select, we can reuse it for add.

Test plan:
Have a patron with spaces in their name
Add users to a fund
Notice that the name is correctly displayed.

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 6779e64d955f6e90e05eba19fd4d7d3606ae15ec)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>