lib/core: Removed a few abusive uses of `to_s_with_length` on Array and NativeArray
lib/core: Removed a few abusive uses of `to_s_with_length` on Array and NativeArray

Since they're working with Nit-produced Strings, there's no need to clean once more

Signed-off-by: Lucas Bajolet <fb7058dfc24bf257c276819183d58e00527fa733@hotmail.com>

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