fix(DatePicker): error when unselecting a date

[hartbit]

This resolves #1618.

Again, I failed to reproduce the issue in unit tests. I tried this, unsuccessfully:

  it('does not throw when selecting the same date twice', async () => {
    const { user, trigger, getByTestId, rerender } = setup({
      datePickerProps: { modelValue: calendarDate },
      emits: { 'onUpdate:modelValue': (data: DateValue) => rerender({ modelValue: data }) },
    })

    await user.click(trigger)
    const selectedDay = getByTestId('calendar').querySelector<HTMLElement>('[data-selected]')!
    await user.click(selectedDay)
  })

[zernonia]

Thanks for the @hartbit ! Yeah the unit test can be abit tricky sometimes 🙈

[pkg-pr-new]

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npm i https://pkg.pr.new/radix-vue@1619

commit: 440eae4