remove most letter branding

tests/app/organisation/test_rest.py

@@ -17,7 +17,6 @@ from tests.app.db import (
     create_domain,
     create_email_branding,
     create_ft_billing,
-    create_letter_branding,
     create_organisation,
     create_service,
     create_template,
@@ -76,7 +75,6 @@ def test_get_organisation_by_id(admin_request, notify_db_session):
         'agreement_signed_version',
         'agreement_signed_on_behalf_of_name',
         'agreement_signed_on_behalf_of_email_address',
-        'letter_branding_id',
         'email_branding_id',
         'domains',
         'request_to_go_live_notes',
@@ -95,7 +93,6 @@ def test_get_organisation_by_id(admin_request, notify_db_session):
     assert response['agreement_signed'] is None
     assert response['agreement_signed_by_id'] is None
     assert response['agreement_signed_version'] is None
-    assert response['letter_branding_id'] is None
     assert response['email_branding_id'] is None
     assert response['domains'] == []
     assert response['request_to_go_live_notes'] is None
@@ -439,23 +436,19 @@ def test_update_organisation_default_branding(
     org = create_organisation(name='Test Organisation')
 
     email_branding = create_email_branding()
-    letter_branding = create_letter_branding()
 
     assert org.email_branding is None
-    assert org.letter_branding is None
 
     admin_request.post(
         'organisation.update_organisation',
         _data={
             'email_branding_id': str(email_branding.id),
-            'letter_branding_id': str(letter_branding.id),
         },
         organisation_id=org.id,
         _expected_status=204
     )
 
     assert org.email_branding == email_branding
-    assert org.letter_branding == letter_branding
 
 
 def test_post_update_organisation_raises_400_on_existing_org_name(