Non-static method ProjectHandler::getProjects() should not be called statically

[16-Oct-2013 19:17:38 UTC] PHP Strict Standards:  Non-static method
ProjectHandler::getProjects() should not be called statically, assuming
$this from incompatible context in
/www/translatewiki.net/w/extensions/TwnMainPage/ResourceLoaderProjectIconsModule.php
on line 21

Change-Id: I09a6df531c7d347843cfcf50008534af4debe455