typo on widget.php file

Hi – Thanks for the great plugin. I use it all the time and saves me a ton of work – the options are ideal!

Just wanted to let you know that we discovered a typo on the widget.php file: one-sixth was mis-spelled as one-sixith, causing that column class not to work as intended.

Thanks!

https://www.ads-software.com/plugins/genesis-featured-content-widget/