[#334] Fix keyboard on macOS

[cpick]

Fixes https://github.com/renode/renode/issues/334

[CLAassistant]

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[kotval]

If I implemented the requested changes, can this be merged or do we need the other contributor to sign the license agreement as well?

[pgielda]

Yes, @cpick has to sign the CLA or it has to be implemented from scratch (unless you have a right to sign CLA for this code, e.g. if you work at the same company/institution and this code is owned by this company and you are allowed to sign CLAs on behalf of this company/institution)

[cpick]

Thanks for the response.

I'm not interested in signing a CLA that would allow my contribution to be used under a license that I may not support in the future.