Revert unnecessary change to babel config

[VanTanev]

Turns out, @Andarist was correct in #231 (comment) - because babel was updated, this setting is not needed.

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[Andarist]

Hm, when was Babel updated though? 😅 I don't see any recent upgrades - so I wonder: why you have observed broken behavior before and why the change turned out to be unnecessary now?

[VanTanev]

My guess is that my local node_modules got into a bad state somehow? I cannot replicate the error I was getting before 😭

I thought that the upgrade of @preconstruct/cli might have been the fix after all, but that's not the case, because it works fine even without it.