Remove referrer policy

Author: ostefano

core/files/etc/nginx/includes/misp

@@ -6,7 +6,6 @@ index index.php;
 client_max_body_size 50M;
 
 # added headers for hardening browser security
-add_header Referrer-Policy "no-referrer" always;
 add_header X-Content-Type-Options "nosniff" always;
 add_header X-Download-Options "noopen" always;
 add_header X-Frame-Options "SAMEORIGIN" always;