fix versioning for movable apps

apps/files_versions/history.php

@@ -20,7 +20,6 @@
  * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
  * 
  */
-require_once( '../../lib/base.php' );
 
 OCP\User::checkLoggedIn( );
 OCP\Util::addStyle('files_versions','versions');