Bug 36825: Hide "Protected" field via BorrowerUnwantedField syspref

Bug 36825: Hide "Protected" field via BorrowerUnwantedField syspref

Setting field "Protected" as hidden in patron entry/modification
form via BorrowerUnwantedField syspref doesn't work. Form is
missing condition "UNLESS noprotected".

To test:
1. From BorrowerUnwantedField, check field "Protected" as hidden.
2. Either attempt to create a new patron or modify existing one.
=> Note that "Protected" is still displayed in the form.
3. Apply this patch.
4. Navigate back to create/modify patron form.
=> Note that "Protected" is no longer displayed.
5. Uncheck field "Protected" from BorrowerUnwantedField.
=> Field should now be displayed in create/modify form.

Sponsored-by: Koha-Suomi Oy
Signed-off-by: Andrew Fuerste Henry <andrewfh@dubcolib.org>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>