Remove notify_go_live_incomplete tag

The new taxonomy doesn't have a `notify_go_live_incomplete` tag. We
replaced this with `notify_go_live_incomplete_mou` because the only way
users can submit an incomplete request is if they do not agree to the
MOU.

These are the incomplete tags:

- `notify_go_live_incomplete_mou`
- `notify_go_live_incomplete_reply_to`
- `notify_go_live_incomplete_shared_email`
- `notify_go_live_incomplete_templates`

Of those, only the first one is applied automatically.

app/models/service.py

@@ -625,7 +625,6 @@ class Service(JSONModel):
             return
 
         for test, tag in (
-            (True, ''),
             (not self.volumes, '_volumes'),
             (not self.go_live_checklist_completed, '_checklist'),
             (not self.organisation.agreement_signed, '_mou'),