[TIMOB-25612] iOS 11 : navigationBar title close/open animation is not proper in Titanium apps than inbuilt apps

When *'largeTitleEnabled'* property is set to true for iOS 11, the animation which takes place between the *backButtonTitle* of next window & the title of current window (hidden window) is not smooth. Large title of previous window flickers when animation happens back to previous window. It goes this way: 1- Window A has *largeTitleEnabled : true* 2- Window B has *largeTitleEnabled : false* 3- Open Window B from Window A, title transition animation goes smooth here. 4- Now close Window B & notice the flickering in *title of Window A* But this flickering doesn't happens in inbuilt apps like Settings, etc. Please see attached video to see the difference in title & backbutton transition between 2 windows in *inbuilt Settings* app & *Titanium Samples* app. Here's the sample code for this:

var winA = Ti.UI.createWindow({
	backgroundColor : '#444',
	largeTitleEnabled : true,
	title : "Window A"
});

var winB = Ti.UI.createWindow({
	backgroundColor : '#444',
	largeTitleEnabled : false,   // even leaving this property to its default value cause mis-behaviour in title transition, try this code by deleting this line as well, it will mis-behave
	title : "Window B"
});

var button = Ti.UI.createButton({ 
	title : '  Open Window A  ',
	backgroundColor : "#0ba",
	color : '#fff'
});

var navWindow = Ti.UI.iOS.createNavigationWindow({
	window : winA
});

button.addEventListener('click', function () {
	navWindow.openWindow(winB);
});

winA.add(button);

navWindow.open();