Remove the Persona TOS/PP notice from everywhere but the authentication page.

The Persona TOS/PP is *only* shown to users who are not authenticated to Persona. Otherwise users have already agreed and no longer need to see it.
Move the Persona TOS/PP text above the submit button

fixes #2669
Merge pull request #2933 from shane-tomlinson/issue_2669_tos_pp_above_button

Issue 2669 tos pp above button

@ozten and @skinny have r+'d this, merging.