Hide download CSV link when in the tour

There is really no point to downloading the CSV file of delivery
info when you’re in the tour. It’s just distracting at this point.

app/templates/partials/jobs/notifications.html

@@ -4,7 +4,7 @@
   <div class="dashboard-table">
 {% endif %}
 
-  {% if notifications %}
+  {% if notifications and request.args.get('help', '0') == '0' %}
     <p class="bottom-gutter">
       <a href="{{ url_for('.view_job_csv', service_id=current_service.id, job_id=job.id, status=status) }}" download="download" class="heading-small">Download as a CSV file</a>
       &emsp;