runner: remove spurious reinit of env._G and env._ENV.
runner: remove spurious reinit of env._G and env._ENV.

* lib/specl/runner.lua (initenv): The environments we pass in
here are created by deepcopy, which sets _G (and _ENV) correctly
when present.  No need to do it again!

Signed-off-by: Gary V. Vaughan <f9023000f29773649f3850298becb9544b5fd6a9@gnu.org>

gvvaughan/specl