fix missing cancel link

templates/lambdainst/account.html

@@ -38,6 +38,7 @@
                         <b>FAILING</b> since {{since}}. ({{backend}})<br />
                         Please cancel and subscribe again if you need to switch to another payment method.
                         {% endblocktrans %}
+                        (<a href="{% url 'payments:cancel_subscr' %}">{% trans "cancel" %}</a>)
                     {% elif subscription.status == 'active' %}
                         {% blocktrans trimmed with until=subscription.next_renew|default:user.vpnuser.expiration|date:'Y-m-d' backend=subscription.backend.backend_verbose_name %}
                         <b>ACTIVE</b>. Renews on {{until}} via {{backend}}.