Bug 35474: Add icon for protected patrons

Bug 35474: Add icon for protected patrons

This patch adds a "protected" icon (fa-lock) to the patron information
in the sidebar of patron-related pages in the staff interface.

To test, apply the patch and perform a patron search in the staff
interface.

- Edit a patron and go to the "Library management" section.
- Set "Protected" to "Yes."
- Save the record and view the information in the sidebar. You should
  see the lock icon by the patron's name.

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>