Update FrontController.php

when you're on secured order page (with ssl) and when you're trying to read TOS - in all modern browsers you see this: [blocked] The page at https://localhost/1560a/index.php?controller=order ran insecure content from http://localhost/1560a/index.php?id_cms=3&controller=cms&id_lang=1&content_only=1.

It appears even if I change http:// to https:// in {$link_conditions} variable. Prestashop automatically change the secured url to unsecured, this is the most annoying thing so in my opinion this code should be removed!

more about mixed content filtering: https://blog.mozilla.org/tanvi/2013/04/10/mixed-content-blocking-enabled-in-firefox-23/
for now all modern browsers use the same filtering method.