[-] CORE : $link_conditions with SSL

SSL parameter added to add https to the terms of services link for fancy fancy box on OPC page.
Found this bug in this configuration : 
1.6 store + 1.6 PS bootstrap theme + SSL + account created + disconnected
1- add a product to the cart
2- Go to OPC 
3- Check that the link to terms of services (fancy box) has HTTPS
4- login on the OPC page (already has an account click here)
>> The terms of services does NOT have the HTTPS. So the cms page won't load there is this error message in the debug console : 

[blocked] The page at 'https://www.______________.com/fr/commande-rapide' was loaded over HTTPS, but ran insecure content from 'http://www.______________.com/fr/content/conditions-d-utilisation-3?content_only=1': this content should also be loaded over HTTPS.