Bug 16238 [Follow-up] Upgrade jQuery in staff client: use .prop() instead of .attr()

Bug 16238 [Follow-up] Upgrade jQuery in staff client: use .prop() instead of .attr()

This patch corrects some tabs which should have been replaced with
spaces.

To test, diff against the previous commit with the '-w' flag. There
should be no visible changes.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Space changes, no errors.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>