In other extensions of `AbstractAuthenticationToken`, the constructors
that include `authorities` call `setAuthenticated(true)`. This includes
`PreAuthenticated`-, `UsernamePassword`-, and
`RememberMeAuthenticationToken`.
This change brings `TestingAuthenticationToken` in line with that
convention.
Note that this was done once already to one of the constructors
(ee13be4) in `TestingAuthenticationToken` that takes an arity of
`authorities`. It was not propagated to the constructor that takes a
collection, which is what this commit remedies.
Fixes: gh-5073
Josh Cummings
776b378a1d