[AC-3088] iOS: Switch is not show on the screen if its "value" property is not set

The problem

Switch control in not shown on the screen unless its "value" property is not set to some value.

Test case

To see the issue, run this example:

(function() {
      
    var win = Ti.UI.createWindow({
		navBarHidden: true,
		backgroundColor: '#000'
	});
	
	win.add(Ti.UI.createSwitch());
	
	win.open();
	
})();

Switch shouldn't be present on the screen.

Expected behaviour

Switch should be show on the screen even without a need to set "value" property to some value.

Workaround

Set "value" property to some initial value: win.add(Ti.UI.createSwitch({ value: false }));