pfpki: editing PKI templates is possible but not taken into account

[nqb]

Describe the bug
On PF v11.1.1, if you edit a PKI template to change settings, frontend lets you perform your operation. After you click on "Save", some fields become empty and values are not updated in DB.

To Reproduce
Steps to reproduce the behavior:

1. Create a CA and a PKI template with a Country and a Locality values
2. Change "Country" setting in your PKI template
3. Save

=> Country and Locality fields became empty

Expected behavior
I'm not sure what should be the expected behavior. I remembered it was not possible to edit PKI templates in the past.

[fdurand]

covert by PR #6767