Use save instead of update when changing FacilityClaim

Using `QuerySet.update()` bypasses `django-simple-history`, which we do not
want.

src/django/api/views.py

@@ -2029,44 +2029,38 @@ def get_claimed_details(self, request, pk=None):
                     .objects \
                     .get(pk=parent_company_data['id'])
 
-            FacilityClaim.objects.filter(pk=pk).update(
-                facility_description=request.data.get('facility_description'),
-                facility_name=request.data.get('facility_name'),
-                facility_address=request.data.get('facility_address'),
-                facility_phone_number=request.data
-                .get('facility_phone_number'),
-                facility_phone_number_publicly_visible=request.data
-                .get('facility_phone_number_publicly_visible'),
-                facility_website=request.data.get('facility_website'),
-                facility_minimum_order_quantity=request.data
-                .get('facility_minimum_order_quantity'),
-                facility_average_lead_time=request.data
-                .get('facility_average_lead_time'),
-                parent_company=parent_company,
-                point_of_contact_person_name=request.data
-                .get('point_of_contact_person_name'),
-                point_of_contact_email=request.data
-                .get('point_of_contact_email'),
-                point_of_contact_publicly_visible=request.data
-                .get('point_of_contact_publicly_visible'),
-                office_official_name=request.data
-                .get('office_official_name'),
-                office_address=request.data.get('office_address'),
-                office_country_code=request.data.get('office_country_code'),
-                office_phone_number=request.data.get('office_phone_number'),
-                office_info_publicly_visible=request.data
-                .get('office_info_publicly_visible')
+            claim.parent_company = parent_company
+
+            field_names = (
+                'facility_description',
+                'facility_name',
+                'facility_address',
+                'facility_phone_number',
+                'facility_phone_number_publicly_visible',
+                'facility_website',
+                'facility_minimum_order_quantity',
+                'facility_average_lead_time',
+                'point_of_contact_person_name',
+                'point_of_contact_email',
+                'point_of_contact_publicly_visible',
+                'office_official_name',
+                'office_address',
+                'office_country_code',
+                'office_phone_number',
+                'office_info_publicly_visible',
             )
 
-            updated_claim = FacilityClaim.objects.get(pk=pk)
+            for field_name in field_names:
+                setattr(claim, field_name, request.data.get(field_name))
+
+            claim.save()
 
             try:
-                send_claim_update_notice_to_list_contributors(request,
-                                                              updated_claim)
+                send_claim_update_notice_to_list_contributors(request, claim)
             except Exception:
-                _report_facility_claim_email_error_to_rollbar(updated_claim)
+                _report_facility_claim_email_error_to_rollbar(claim)
 
-            response_data = ApprovedFacilityClaimSerializer(updated_claim).data
+            response_data = ApprovedFacilityClaimSerializer(claim).data
             return Response(response_data)
         except FacilityClaim.DoesNotExist:
             raise NotFound()