Revert "fix(Contact): use existing full name" (#22119)

This reverts commit 296d6e9.

frappe/contacts/doctype/contact/contact.py

@@ -179,15 +179,18 @@ def invite_user(contact):
 @frappe.whitelist()
 def get_contact_details(contact):
 	contact = frappe.get_doc("Contact", contact)
-	return {
+	out = {
 		"contact_person": contact.get("name"),
-		"contact_display": contact.get("full_name"),
+		"contact_display": " ".join(
+			filter(None, [contact.get("salutation"), contact.get("first_name"), contact.get("last_name")])
+		),
 		"contact_email": contact.get("email_id"),
 		"contact_mobile": contact.get("mobile_no"),
 		"contact_phone": contact.get("phone"),
 		"contact_designation": contact.get("designation"),
 		"contact_department": contact.get("department"),
 	}
+	return out
 
 
 def update_contact(doc, method):