Further CUDA support for IF-1

[naailkhan28]

Resolves #374 - now model.sample takes an optional device argument. util.get_encoder_output and multichain_util.sample_sequence_in_complex will use the same device that the model is on already here.

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[naailkhan28]

Updated sample_sequences.py and score_log_likelihoods.py, should be all set!

[naailkhan28]

@brianhie I've added another commit that should fix this - it looks like it was an error in inverse_folding.util.get_sequence_loss

[brianhie]

LGTM! Confirmed scoring between default and --nogpu, will merge. Thanks @naailkhan28 for the contribution!