[PSCSX-6883] Making check if module is trusted case sensitive

Official description: BO : Fixed checking if module is trusted PSCSX-6883

This vulnerability affects the following application versions:

• PrestaShop 1.6.0.9
• PrestaShop 1.6.0.11
• PrestaShop 1.6.0.12
• PrestaShop 1.6.0.13
• PrestaShop 1.6.0.14
• PrestaShop 1.6.1.0
• PrestaShop 1.6.1.0 RC4
• PrestaShop 1.6.1.1