Fix indentation of HAProxy internal http-request config

Related: blueprint add-ssl-internal-network
Co-Authored-By: generalfuzz <generalfuzz@gmail.com>

Change-Id: Ib79796d49c415d8314ea5661a16bd2dac8ba7188

ansible/roles/haproxy-config/templates/haproxy_single_service_listen.cfg.j2

@@ -46,7 +46,7 @@ listen {{ service_name }}
         {% if service_mode == 'http' %}
             {% set tls_option = internal_tls_bind_info %}
     {# Replace the XFP header for internal https requests #}
-        http-request set-header X-Forwarded-Proto https if { ssl_fc }
+    http-request set-header X-Forwarded-Proto https if { ssl_fc }
         {% endif %}
     {% endif %}
     {{ "bind %s:%s %s"|e|format(vip_address, service_port, tls_option)|trim() }}