FX.54 Student Program: leftovers from when staff approved applications

/admin/students opened on an always-empty Waiting tab: it now opens on Active, and Waiting hides when empty. The form's note hint promised a proof-by-reply check that no longer existed. The welcome email's preview said "Sign in with your school email" even for other addresses. The verify email still said a person would check non-school addresses. The kit said a .edu address was needed for an instant license. All corrected. Also: t= links are now hidden in the analytics log, because the status link is private.