Fix plugin setting retrieval in renewtoken.php
Fix plugin setting retrieval in renewtoken.php

It tried to get the settings via `common_config()`, which works if
settings are in `$config['TranslateNotice']['foo'] = 'bar';` format,
but our plugin settings are passed via
`addPlugin('TranslateNotice', array('foo' => 'bar'));`

chimo/gs-translate,chimo/gs-translate