Fix `nonlinearity` arg issue in RNN

[yuanx749]

Fixes #114617

This PR fix the the issue with nonlinearity, so that it can be passed as arg or kwarg.

Alternatively, if making nonlinearity kwarg-only is preferred, I can revert to another commit. cc @mikaylagawarecki

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[yuanx749]

Sure. I added a test. @mikaylagawarecki

[yuanx749]

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[mikaylagawarecki]

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