Use goBack when target view is already on the navigation stack

[quickrworld]

In order to achieve proper usability experience, you would need to pop the current route as Deck View is already on the navigation stack. The following snippet should the trick.

quizHome = () => {
// ...
    this.props.navigation.goBack()
}

Existing code:

quizHome = () => {
    const { viewing } = this.props.decks
    this.props.initAnswering(viewing)
    this.setState({ showAnswer: false })
    this.setState({ quizComplete: false })
    this.props.navigation.navigate('QuizStart')
}

[quickrworld]

Completed and tested