[fix] Adding typealias forgotten in #5338

After merging #5338, we get 2 errors:
[11-Dec-2014 07:35:44 UTC] PHP Notice:  Undefined property: ModulesModelModule::$typeAlias in /Applications/MAMP/htdocs/trunkgitnew/libraries/legacy/model/admin.php on line 216

and

[11-Dec-2014 07:27:19 UTC] PHP Notice:  Undefined property: MenusModelItem::$typeAlias in /Applications/MAMP/htdocs/trunkgitnew/libraries/legacy/model/admin.php on line 216


This PR solves them.