[TIMOB-24233] Android: stacked background drawable parity

[frankieandone]

JIRA: https://jira.appcelerator.org/browse/TIMOB-24233

Test Case
Should see same thing on iOS

var win1 = Ti.UI.createWindow({
	backgroundColor: 'blue',
	title: 'Blue'
});
win1.add(Ti.UI.createLabel({text: 'I am a blue window.'}));

var win2 = Ti.UI.createWindow({
	backgroundColor: 'red',
	title: 'Red'
});
win2.add(Ti.UI.createLabel({text: 'I am a red window.'}));

var tab1 = Ti.UI.createTab({
			window: win1,
			title: 'Blue'
		}),
		tab2 = Ti.UI.createTab({
			window: win2,
			title: 'Red'
		});

var group = Ti.UI.createTabGroup({
	tabs: [tab1, tab2],
	tabsBackgroundColor: 'green'
});

group.open();

[garymathews]

CR: PASS
FT: PASS

[lokeshchdhry]

@fmerzadyan @garymathews, in landscape mode I do not see the color when tabsBackgroundColor is set. Is this expected?

[lokeshchdhry]

Changes looks good for both classic & alloy projects.
tabsBackgroundColor works in landscape mode as well.