R1:4af73a625fe1

Don't require users be logged in to access the Logout controller, so users with no Spaces can log out

Summary:
Fixes T13310. Use cases in the form "users with no access to any spaces can not <do things>" are generally unsupported (that is, we consider this to mean that the install is misconfigured), but "log out" is a somewhat more reasonable sort of thing to do and easy to support.

Drop the requirement that users be logged in to access the Logout controller. This skips the check for access to any Spaces…