MzpNavigation doesn't check for MzpSupports availability correctly

[janbrasna]

Description

MzpNavigation.menuButtonVisible() and MzpNavigation.setAria() don't check for window.MzpSupports availability the way it was intended to.

Steps to reproduce

protocol/assets/js/protocol/navigation.js

Lines 209 to 210 in 2820247

	MzpNavigation.setAria = () => {
	if (MzpSupports !== 'undefined' && MzpSupports.intersectionObserver) {

Expected result

typeof MzpSupports !== 'undefined'

Actual result

MzpSupports !== 'undefined'