fix test case in question-232

[zhzhch335]

In question 232，we need change add key modifiers made this will fire even if Alt or Shift is also pressed. But in the test case of question 232, if we passed the case

await buttons[0].trigger('click.alt')
expect(printLog).toMatchInlineSnapshot('"onClick1"')

printLog can't be empty, so that the case will always be passed until the next time to call console.log.
So even if the answer only writes alt key modifer like this:

<button @click.alt="onClick1">A</button>

it's still passed.

Futhermore, there isn't a case includes Alt and Shift are pressed at the same time, I added.

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