change server signature

manifests/init.pp

@@ -337,6 +337,8 @@ class mastodon (
       { 'path' => '/mask-icon.svg', 'url' => '!' },
     ],
     custom_fragment       => '
+        ServerSignature Off
+        
         ProxyPass /api/v1/streaming ws://localhost:4000
         ProxyPassReverse /api/v1/streaming ws://localhost:4000
         ProxyPass / http://localhost:3000/
@@ -398,7 +400,7 @@ class mastodon (
     docroot         => "${mastodon_home}/live/public",
     redirect_status => 'permanent',
     redirect_dest   => "https://${hostname}/",
-    server_signature => false,
+    custom_fragment => 'ServerSignature Off',
   }
 
   # systemd units