remove "doesn't work for pytorch" from SimBA tests

[Embeddave]

Is your feature request related to a problem? Please describe.
When troubleshooting the SimBA attack I found several places in the tests that state it does not work for torch:

adversarial-robustness-toolbox/tests/attacks/test_simba.py

Line 42 in 85ca10f

Note: SimBA runs only in Keras and TensorFlow (not in PyTorch)

adversarial-robustness-toolbox/tests/attacks/test_simba.py

Line 97 in 85ca10f

# SimBA is not available for PyTorch

(which is particularly surprising since it was originally written in torch)

Describe the solution you'd like
Remove that language from comments in tests or please clarify if there's something I'm not understanding.
After troubleshooting I was able to run the attacks with a torch model.
It does seem to be working for me, although I haven't done extensive runs yet.

[beat-buesser]

Moved back to issue #1410, Please apologise the confusion.