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fix: remove parantheses to make except work

The expression `[:__struct__] -- except` evaluates to `[:__struct__]`
(since except typically doesn't contain `:__struct__)`, so the final
result is `Map.keys(struct) -- [:__struct__]` — the except fields are
never removed.

This especially happens when deriving from Ecto schemas and ignoring the
`__meta__` like this:
`@derive {Toon.Encoder, except: [:__meta__]}`

This solves it by removing the parentheses. The PR adds necessary tests
to make sure this is fixed.