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/response.js

@@ -60,6 +60,7 @@ function showIndex (req, res, next) {
     url: config.serverurl,
     useCDN: config.usecdn,
     allowAnonymous: config.allowanonymous,
+    allowAnonymousEdits: config.allowanonymousedits,
     facebook: config.isFacebookEnable,
     twitter: config.isTwitterEnable,
     github: config.isGitHubEnable,
@@ -93,6 +94,7 @@ function responseHackMD (res, note) {
     title: title,
     useCDN: config.usecdn,
     allowAnonymous: config.allowanonymous,
+    allowAnonymousEdits: config.allowanonymousedits,
     facebook: config.isFacebookEnable,
     twitter: config.isTwitterEnable,
     github: config.isGitHubEnable,