Show terms and privacy policy if FxA is enabled (bug 1033851)

Add the terms and privacy policy links on create-pin if FxA is enabled (based on the data attr)

![firefox_os_simulator](https://cloud.githubusercontent.com/assets/1514/3937583/10baacec-24af-11e4-9acc-b383b8874fdb.png)

It gets dismissed as soon as you type a char or cause an error (so there's room for the error).


if no numbers are filled in should it show the terms? I.E. you could add an else clause here to remove the hidden class.