bug 1080877 - Update terms template to match new and 10th ann design

The demo studio's terms design isn't great.  This fixes said issue.  Hit "https://developer-local.allizom.org/en-US/demos/terms#tfc" to check it out.
I'm not sure I understand this change. Won't this strip away all demo styles if/when we disable the flag? Did we mean to invert this condition?