fix(display): check data after reload from self-service

[stonebuzz]

When self-service select an itil categorie from tick

form is reload and fields don't take care of new value

Only work for itilcategories_id because thatt trigger a reload of form

Fix : (portal) !6633

[cedric-anne]

Only work for itilcategories_id because thatt trigger a reload of form

I think this is a similar issue as #524 . We should adapt display state of containers depending on current values in form. For instance, if a rule indicates that a container should be displayed when Group in charge == "Example group", corresponding fields should be displayed in current form when this group is selected, but currently form has to be submitted and values saved to be able to apply display rules.

So, for me, the technical solution is to send an AJAX query containing all form values everytime a field is changed in the form, in order to recompute visibility of fields based on target values (i.e. array_merge($item->fields, $form_values)).