Bug 26988: (follow-up) Change event to focus

Bug 26988: (follow-up) Change event to focus

Click event on select element if Firefox does not work as expected, so
this patch changes the event to focus for it to work seamlessly in both
browsers.

https://bugs.koha-community.org/show_bug.cgi?id=26899
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 7edb1a55bc54fd5c68700e703be9deff3d6a0199)

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>