Fixing "the map directive is not allowed here" at the validation stage (see https://github.com/NginxProxyManager/nginx-proxy-manager/pull/3478)

backend/templates/_location.conf

@@ -1,5 +1,3 @@
-  {% include "_hsts_map.conf" %}
-
   location {{ path }} {
     proxy_set_header Host $host;
     proxy_set_header X-Forwarded-Scheme $scheme;