Enable the choice of action space

[luigiquara]

This fixes an error occurring when specifying an action space in the creation of the environment.
To reproduce the error:

actions = tuple(nle.nethack.CompassDirection)
env = gym.make('NetHackChallenge-v0', actions=actions)

Error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/lquarantiello/miniconda3/envs/nle/lib/python3.8/site-packages/gym/envs/registration.py", line 676, in make
    return registry.make(id, **kwargs)
  File "/home/lquarantiello/miniconda3/envs/nle/lib/python3.8/site-packages/gym/envs/registration.py", line 520, in make
    return spec.make(**kwargs)
  File "/home/lquarantiello/miniconda3/envs/nle/lib/python3.8/site-packages/gym/envs/registration.py", line 140, in make
    env = cls(**_kwargs)
  File "/home/lquarantiello/miniconda3/envs/nle/lib/python3.8/site-packages/nle/env/tasks.py", line 328, in __init__
    super().__init__(
TypeError: __init__() got multiple values for keyword argument 'actions'

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