Do not use ignored arguments in solution stub

[angelikatyborska]

Resolves https://github.com/exercism/elixir/issues/1517 Resolves https://github.com/exercism/elixir/issues/1519

We don't use ignored arguments in solution stubs for most exercises, so we shouldn't use it in any of them. I was grepping for \(_, and , _ to find underscored arguments in practice exercises and only found those two.

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