Fix link to dashboard from end of tour

The notification page was different to the job page in that it
passed through the whole template, not just the ID.

app/templates/main_nav.html

@@ -32,7 +32,7 @@
             Notify delivers the message
           </p>
           {% if help == '3' %}
-            <a href='{{ url_for(".go_to_dashboard_after_tour", service_id=current_service.id, example_template_id=template_id) }}'>
+            <a href='{{ url_for(".go_to_dashboard_after_tour", service_id=current_service.id, example_template_id=template.id) }}'>
               Now go to your dashboard
             </a>
           {% endif %}

tests/app/main/views/test_send.py

@@ -1334,7 +1334,27 @@ def test_check_messages_back_link(
     ) == expected_url(service_id=fake_uuid, template_id=fake_uuid)
 
 
-def test_go_to_dashboard_after_tour(
+def test_shows_link_to_end_tour(
+    client_request,
+    mock_get_notification,
+    fake_uuid,
+):
+
+    page = client_request.get(
+        'main.view_notification',
+        service_id=SERVICE_ONE_ID,
+        notification_id=fake_uuid,
+        help=3,
+    )
+
+    assert page.select(".banner-tour a")[0]['href'] == url_for(
+        'main.go_to_dashboard_after_tour',
+        service_id=SERVICE_ONE_ID,
+        example_template_id='5407f4db-51c7-4150-8758-35412d42186a',
+    )
+
+
+def test_go_to_dashboard_after_tour_link(
     logged_in_client,
     mocker,
     api_user_active,

tests/conftest.py

@@ -1678,7 +1678,7 @@ def mock_get_notification(
         noti['personalisation'] = {'name': 'Jo'}
         noti['template'] = template_json(
             service_id,
-            str(generate_uuid()),
+            '5407f4db-51c7-4150-8758-35412d42186a',
             content='hello ((name))',
             redact_personalisation=redact_personalisation,
         )