nginx/application: Set type to text for test file

roles/nginx/application/templates/acme.conf

@@ -1,5 +1,9 @@
 location /{{ acme_validation_directory }} {
     root {{ nginx_validation_root_directory }};
     access_log off;
+    location = /{{ acme_validation_directory }}/test {
+        types {}
+        default_type text/html;
+    }
     try_files $uri $uri/ =404;
 }