Set free SMS limit depending on organisation type

Different parts of government get billed slightly differently, and
there’s differences in how much money we’re allowed to give them.

Think these numbers are right, but should be double checked.

app/notify_client/service_api_client.py

@@ -20,6 +20,7 @@ class ServiceAPIClient(NotifyAdminAPIClient):
         self,
         service_name,
         organisation_type,
+        free_sms_fragment_limit,
         message_limit,
         restricted,
         user_id,
@@ -31,6 +32,7 @@ class ServiceAPIClient(NotifyAdminAPIClient):
         data = {
             "name": service_name,
             "organisation_type": organisation_type,
+            "free_sms_fragment_limit": free_sms_fragment_limit,
             "active": True,
             "message_limit": message_limit,
             "user_id": user_id,