Add option to enable freely permission in closed instance

Before, closed disallowed guest edits completely, by removing
the `freely` permission. This makes it possible to explicitely bring
back guest-editing, but not guest-note-creation, to closed instances.

Signed-off-by: Dario Ernst <dario@kanojo.de>

lib/config/index.js

@@ -49,7 +49,7 @@ if (config.ldap.tlsca) {
 
 // Permission
 config.permission = Permission
-if (!config.allowanonymous) {
+if (!config.allowanonymous && !config.allowanonymousedits) {
   delete config.permission.freely
 }
 if (!(config.defaultpermission in config.permission)) {