Bug: An optional single-choice answer cannot be skipped after selection

[nesnass]

Describe the bug
When a question is set to required: false and also multiple: false it is not possible to de-select an answer.
That means it's not possible to skip the question after a mistaken selection, even though 'required' is false.

To Reproduce
Use the following question setup:

new QuestionModel({
  id: 'singleChoice1',
  title: 'Single choice question',
  type: QuestionType.MultipleChoice,   (or QuestionType.Dropdown)
  multiple: false,
  required: false,
})

Expected behavior
In this case it should be possible to de-select an answer, so that the 'skip' button is again visible

Desktop (please complete the following information):

• Device: Apple Mac
• OS: MacOS
• Browser Chrome
• Version 123.0.6312.87