fix(android): make tabBarVisible work at creation

[m1ga]

You can set tabBarVisible:false on creation now to hide it by default:

const isAndroid = Ti.Platform.osname === 'android';
let tabGroup;

const window = Ti.UI.createWindow();

const btn = Ti.UI.createButton({
	title: 'Show / hide tab group'
});

btn.addEventListener('click', () => {
	tabGroup.tabBarVisible = !tabGroup.tabBarVisible;
});

window.add(btn);

tabGroup = Ti.UI.createTabGroup({
	style: isAndroid ? Ti.UI.Android.TABS_STYLE_BOTTOM_NAVIGATION : undefined,
	tabBarVisible: false,    // NEW - will hide it at the beginning
	tabs: [
		Ti.UI.createTab({
			window,
			title: window.title
		})
	]
});

tabGroup.open();

At that time I can't get the height of the bar yet. The default height is 147dp. Moving it 500dp down should work on all devices.

[hansemannn]

It's a quite hacky fix (I would have preferred to calculate the height automatically), but we can work with this for now.

[cb1kenobi]

APPROVED!

[cb1kenobi]

Looks good!