[TIMOB-16136] iOS: TabGroup doesn't adapt its width to screen's width after orientation change

<Alloy>
	<TabGroup>
    	<Tab title="Tab 1" icon="tab_icons/0.png">
       		<Window id="win1" title="Win 1">
           		<Button onClick="openWindow">Open new window</Button>
            </Window>
    	</Tab>
            
   		<Tab title="Tab 2" icon="tab_icons/1.png">
        	<Window id="win2" title="Win 2"/>
    	</Tab>
    	
    	<Tab title="Tab 1" icon="tab_icons/2.png">
        	<Window id="win3" title="Win 3"/>
    	</Tab>
    </TabGroup>	
</Alloy>

"Window":{
    backgroundColor: "white",
    orientationModes: [Ti.UI.PORTRAIT]
}

$.index.open();

var openWindow = function(){
	var win = Ti.UI.createWindow({
		backgroundColor: "white",
		orientationModes: [Ti.UI.PORTRAIT, Ti.UI.LANDSCAPE_LEFT, Ti.UI.LANDSCAPE_RIGHT],
		tabBarHidden: true
	});
	
	$.index.activeTab.open(win);
};