FormTokenField.handleUpArrowKey and down should update setState

[BE-Webdesign]

Currently is:

handleUpArrowKey() {
	this.setState( {
		selectedSuggestionIndex: Math.max( ( this.state.selectedSuggestionIndex || 0 ) - 1, 0 ),
		selectedSuggestionScroll: true,
	} );

	return true; // preventDefault
}

Should be:

handleUpArrowKey() {
	this.setState( ( previousState ) => ( {
		selectedSuggestionIndex: Math.max( ( previousState.selectedSuggestionIndex || 0 ) - 1, 0 ),
		selectedSuggestionScroll: true,
	} ) );

	return true; // preventDefault
}

Applies to down as well:
Current:

handleDownArrowKey() {
	this.setState( {
		selectedSuggestionIndex: Math.min(
			( this.state.selectedSuggestionIndex + 1 ) || 0,
			this.getMatchingSuggestions().length - 1
		),
		selectedSuggestionScroll: true,
	} );

	return true; // preventDefault
}

Should be:

handleDownArrowKey() {
	this.setState( ( previousState ) => ( {
		selectedSuggestionIndex: Math.min(
			( this.state.selectedSuggestionIndex + 1 ) || 0,
			this.getMatchingSuggestions().length - 1
		),
		selectedSuggestionScroll: true,
	} ) );

	return true; // preventDefault
}