[TIMOB-14568] Android: Setting "transform" to null leaves UI artifacts

problem

When setting the *transform* property of a proxy to *null* it leaves UI artifacts (as shown in attached screenshot) on Android. This does not occur on iOS or Mobileweb.

expected

When I set the the *transform* property of a proxy to *null*, I expect the transform to be reset to the identity transform and that there are no UI artifacts of the previous transform left behind.

test case

app.js

var win = Ti.UI.createWindow({
	backgroundColor: '#fff',
	modal: false,
	exitOnClose: true
});
var label = Ti.UI.createLabel({
	text: 'just a test label',
	transform: Ti.UI.create2DMatrix().rotate(45)
});
label.addEventListener('click', function(e) {
	label.transform = null; // must be set to Ti.UI.create2DMatrix() to work around on Android
});

win.add(label);
win.open();