[TIMOB-24426] Remove "Alert" title from alert()

The current alert() function will display a dialog box with a fixed "Alert" title. Since it is not really necessary to have this title and very confusing since you can't change or localize it it would be better to remove it and when you want to have a custom title you can create a custom AlertDialog. Test code:

Ti.UI.setBackgroundColor('white');
var win = Ti.UI.createWindow({
    title: 'Click window to test',
    backgroundColor: 'white',
    layout: "vertical"
});

win.addEventListener("open",function(){
    alert("Test");
})
win.open();

Current output: Alert dialog with title "Alert" and text "Test" Changed output: Alert dialog with just the text "Test"