Add fastcgi_param HTTPS flag to secure templates

install/deb/templates/mail/nginx/default.stpl

@@ -44,6 +44,7 @@ server {
         fastcgi_index index.php;
         include fastcgi_params;
         fastcgi_param SCRIPT_FILENAME $request_filename;
+        fastcgi_param HTTPS on;
     }
     
     location @fallback {

install/deb/templates/mail/nginx/web_system.stpl

@@ -46,6 +46,7 @@ server {
         fastcgi_index index.php;
         include fastcgi_params;
         fastcgi_param SCRIPT_FILENAME $request_filename;
+        fastcgi_param HTTPS on;
     }
     
     error_page 403 /error/404.html;