Disallow cloudtorrent in demo mode

src/apps.js

@@ -776,6 +776,8 @@ function install(data, auditSource, callback) {
     error = validateEnv(env);
     if (error) return callback(error);
 
+    if (settings.isDemo() && constants.DEMO_BLACKLISTED_APPS.includes(appStoreId)) return callback(new BoxError(BoxError.BAD_FIELD, 'This app is blacklisted in the demo'));
+
     const mailboxName = hasMailAddon(manifest) ? mailboxNameForLocation(location, manifest) : null;
     const mailboxDomain = hasMailAddon(manifest) ? domain : null;
     const appId = uuid.v4();