Resolve 013_metaclass_traits.t, but not completed

diff --git a/t/050_metaclasses/failing/013_metaclass_traits.t b/t/050_metaclasses/013_metaclass_traits.t
similarity index 100%
rename from t/050_metaclasses/failing/013_metaclass_traits.t
rename to t/050_metaclasses/013_metaclass_traits.t