fix --use-te-activation-func

[ahmadki]

What does this PR do ?

Fixes #2770

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[Phlip79]

/ok to test 4f56a0a

[jaredcasper]

Why should the activation_func be None if use_te_activation_func is False? My understanding is that option just says wether we should use the TE version of the activation func or not, which should be handled by what backend is being called, not wether there is an activation func at all.