Policy detail: Fix reference to non-existing rule.position attr

Change-Id: I89c7577bb62c167629fc13ce9d6430e27232f5eb
Closes-Bug: #1747515

neutron_fwaas_dashboard/dashboards/project/firewalls_v2/templates/firewalls_v2/_policy_details.html

@@ -17,10 +17,12 @@
     <dt>{% trans "Rules" %}</dt>
     <dd>
       {% if policy.rules %}
+      <ol>
       {% for rule in policy.rules %}
       {% url 'horizon:project:firewalls_v2:ruledetails' rule.id as rule_url %}
-      {{ rule.position }} : <a href="{{ rule_url }}">{{ rule.name|default:rule.id }}</a><br>
+      <li><a href="{{ rule_url }}">{{ rule.name|default:rule.id }}</a></li>
       {% endfor %}
+      </ol>
       {% else %}
       {% trans "-" %}
       {% endif %}