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Clearly, the author's style and spelling errors are something different from the typeface used to produce the original book, nevertheless (assuming the character "ſ" is the one used in the first edition) if you change it, then surely by doing so you destroy part of the historical context of the original book, unless of course the editor notes the changes made, for the reader and then e-book readers would be restricted to the modern version.

Given the choice: (1) modern using "s" (2) original using "ſ" plus modern using "s", then I would opt for the latter, but realise this might not be economically viable.

Perhaps both the original and modern versions could be published as a single dual e-book, providing the best of both worlds, so-to-speak, giving the reader the choice of whether to read one, or both. The same dual e-book idea could be applied to style changes, spelling corrections, though it might not be practical for school versions, say in books where changes are made purely for reasons of political correctness.