Don't leak to non-admin users the current installed version

cps/admin.py

@@ -1029,7 +1029,8 @@ def send_logfile(logtype):
 
 
 @admi.route("/get_update_status", methods=['GET'])
-@login_required_if_no_ano
+@login_required
+@admin_required
 def get_update_status():
     log.info(u"Update status requested")
     return updater_thread.get_available_updates(request.method, locale=get_locale())