[TIMOB-17055] Android: if there are several consecutive alert windows, the latest alert window replaces previous alert windows

Alert window replaces the previous alert windows if there are multiple consecutive alert windows. For example: following code prints only last alert window.

var win1 = Ti.UI.createWindow({
    backgroundColor: 'white',
});
alert('1.Hi');
alert('2.Hi');
alert('3.Hi');
win1.open();

*Actual Result:* Only alert('3.Hi') is visible in the device *Expected Result:* It should show all 3 alerts as stacks. It's not the regression since issue occurs in 3.2.3 GA as well.