[TIMOB-14799] iOS: Prevent clearing TextField after password field had focus

*Problem* On iOS textfields are cleared by default after some password field had the focus. Is this something that could be prevented. I looked at the docs for textfields, but either I cannot find it or it just isn't there. *Example code to reproduce*

var win = Ti.UI.createWindow({
	backgroundColor : 'white'
});

var tf1 = Ti.UI.createTextField({
	value : "textfield1",
	passwordMask : true,
	top : 10,
	width : 200
});
win.add(tf1);

var tf2 = Ti.UI.createTextField({
	value : "textfield2",
	top : 80,
	width: 200
});
win.add(tf2);

win.open();

*Steps to reproduce* 1. click in the password field 2. click in the "normal" textfield 3. press backspace *Expected result* The last character of the textfield is deleted *Actual result* The entire contents of the textfield is now cleared instead of only the last character.