Change registration_redirect to find more programs with open regs

This changes registration_redirect to look for programs with open
V/Deadline/Registration/Student instead of
V/Deadline/Registration/Student/Classes/OneClass.
Previously, registration_redirect only looked for programs with
open FCFS-style registration, but not lottery registration.

(cherry picked from commit 73f3edc481f71a07402b508cb10d0a43b47ecf91)