Add test cases to Secret Handshake exercise

[irene-mandarine]

There is a small gap in test cases which would allow error prone code to pass the tests.
For example, there is checked 32 with empty list as the result (because it's 10_000 in binary), and it works fine for following code (returns empty list on after index == 4 check) :
` fun calculateHandshake(number: Int): List {
val action = Integer.toBinaryString(number).reversed()
val result = mutableListOf()

    for((index, n) in action.withIndex()) {
        if (index == 4) {
            return result.reversed()
        }
        if (n.toString().toInt() == 1) {
           result.add(Signal.values()[index])
        }
    }
    return result
}`

Once you change test number to 33, which also should return an empty list, the list actually contains "WINK"

I propose to add one more test case to cover that little gap

[github-actions]

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