Fixing the sidebar display (advertising) In RTL

Screenshot attached with the bug:
![wp-admin_admin_php_page wpseo_titles](https://f.cloud.github.com/assets/1778512/2469807/34c99288-b006-11e3-8496-df70a822c794.png)

After my commit:
![wp-admin_admin_php_page wpseo_titles](https://f.cloud.github.com/assets/1778512/2469826/c53f34a8-b006-11e3-85e7-656cdfe23533.png)

TNX