Remove redundant letter branding UI test

This is now covered by the unit tests for the new branding module.
Showing the "something else" text box is also already covered by
another UI test, so we don't need it for that either.

tests/app/main/views/test_service_settings.py

@@ -4902,32 +4902,6 @@ def test_letter_branding_request_page_back_link(
     assert back_link[0].attrs['href'] == back_link_url
 
 
-def test_letter_branding_request_page_when_branding_is_same_as_org(
-    mocker,
-    service_one,
-    client_request,
-    mock_get_letter_branding_by_id,
-    mock_get_service_organisation,
-    active_user_with_permissions,
-):
-    service_one['letter_branding'] = sample_uuid()
-    mocker.patch(
-        'app.organisations_client.get_organisation',
-        return_value=organisation_json(letter_branding_id=service_one['letter_branding']),
-    )
-
-    page = client_request.get(
-        '.letter_branding_request', service_id=SERVICE_ONE_ID
-    )
-
-    # Central government organisations who have their own default
-    # branding will do so because they’re exempt from GOV.UK.
-    # We also don’t show their organisation’s branding because they
-    # have it already. So ‘Something else’ is the only option.
-    assert not page.select('input[type=radio]')
-    assert page.select_one('textarea')['name'] == 'something_else'
-
-
 @pytest.mark.parametrize('data, org_type, endpoint', (
     (
         {