[APPSEC-1579] Customer Segment Delete Action uses GET instead of POST request

A Magento administrator could perform malicious actions through an inadequate security check of the form key in the customer segment page.

Part of patch SUPEE-10266

This vulnerability affects the following application versions:

• Magento 1.9.1.1
• Magento 1.9.2.0
• Magento 1.9.2.1
• Magento 1.9.2.2
• 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