fix: removeOne(-1) from the end

[teidesu]

mcve

const b = new Denque([1, 2, 3, 4, 5, 6, 7, 8]);
console.log(b.removeOne(-1));
console.log(b.toArray());

expected result

8
[1, 2, 3, 4, 5, 6, 7]

actual result

8
[2, 3, 4, 5, 6, 7, undefined]

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