Adding form key to widget viewed grid and list to prevent CSRF

To make sure post data for widget viewed and list is ignored when it fails form key check to avoid CSRF.

Part of update 1.9.4.5

This vulnerability affects the following application versions:

• Magento 1.9.2.3
• Magento 1.9.2.4
• Magento 1.9.3.0
• Magento 1.9.3.1
• Magento 1.9.3.2
• Magento 1.9.3.3
• Magento 1.9.3.4
• Magento 1.9.3.6
• Magento 1.9.3.7
• Magento 1.9.3.8
• Magento 1.9.3.9
• Magento 1.9.3.10
• Magento 1.9.4.0
• Magento 1.9.4.1
• Magento 1.9.4.2
• Magento 1.9.4.3
• Magento 1.9.4.4