This edge case was inconsistent between setting outputs directly and
auto-loading. Setting directly did not support args, so just merged
sets, thus resulting in a __functor flake output. When autoloading, a
set with a __functor attr was treated as a function and passed module
args.
To correct this inconsistency, outputs now always supports taking args,
and has the autoloading behavior.
Code that relied on previous behavior is easy to fix, as the value needs
to be converted to a function, which can then return the set with
__functor.
This allows for conveniently making flakes callable.
Setting this is expected to be uncommon in general, but having the
option is useful as flakelight module flakes can use this to reduce the
boilerplate in using them.
