Introducing type casting in admin feature controller to avoid XSS

id_feature Parameter was not properly escaped against XSS.

This vulnerability affects the following application versions:

• PrestaShop 1.7.0.0
• PrestaShop 1.7.0.0 beta1
• PrestaShop 1.7.0.0 beta2
• PrestaShop 1.7.0.0 beta3
• PrestaShop 1.7.0.0 RC0
• PrestaShop 1.7.0.0 RC1
• PrestaShop 1.7.0.0 RC2
• PrestaShop 1.7.0.0 RC3
• PrestaShop 1.7.0.1
• PrestaShop 1.7.0.2
• PrestaShop 1.7.0.3
• PrestaShop 1.7.0.4
• PrestaShop 1.7.0.5
• PrestaShop 1.7.0.6
• PrestaShop 1.7.1.0
• PrestaShop 1.7.1.0 beta1
• PrestaShop 1.7.1.1
• PrestaShop 1.7.1.2
• PrestaShop 1.7.2.0
• PrestaShop 1.7.2.0 RC 1
• PrestaShop 1.7.2.0-RC.1.0
• PrestaShop 1.7.2.1
• PrestaShop 1.7.2.2
• PrestaShop 1.7.2.3
• PrestaShop 1.7.2.4
• PrestaShop 1.7.2.5
• PrestaShop 1.7.3.0
• PrestaShop 1.7.3.0 beta 1
• PrestaShop 1.7.3.0 RC 1
• PrestaShop 1.7.3.1
• PrestaShop 1.7.3.2
• PrestaShop 1.7.3.3
• PrestaShop 1.7.3.4
• PrestaShop 1.7.4.0
• PrestaShop 1.7.4.0 beta 1
• PrestaShop 1.7.4.1
• PrestaShop 1.7.4.2
• PrestaShop 1.7.4.3
• PrestaShop 1.7.4.4
• PrestaShop 1.7.5.0
• PrestaShop 1.7.5.0 beta 1
• PrestaShop 1.7.5.0 RC 1
• PrestaShop 1.7.5.0-beta.1
• PrestaShop 1.7.5.0-RC.1
• PrestaShop 1.7.5.1
• PrestaShop 1.7.5.2
• PrestaShop 1.7.6.0
• PrestaShop 1.7.6.0 beta 1
• PrestaShop 1.7.6.0 RC 1
• PrestaShop 1.7.6.0 RC 2
• PrestaShop 1.7.6.0-beta.1
• PrestaShop 1.7.6.0-RC.1
• PrestaShop 1.7.6.0-RC.2
• PrestaShop 1.7.6.1
• PrestaShop 1.7.6.2
• PrestaShop 1.7.6.3
• PrestaShop 1.7.6.4
• PrestaShop 1.7.6.4 1