[TIMOB-19192] Android 5.0.X: Fix for event fired

[ashcoding]

Fix for event being fired twice. This fixes it by checking that the date
is changed before firing the event.

Jira reopened: https://jira.appcelerator.org/browse/TIMOB-19192

[ashcoding]

Tested with:

var vidWin = Titanium.UI.createWindow({
    title : 'Video View Demo',
    backgroundColor : '#000'
});

var picker = Ti.UI.createPicker({
    type:Ti.UI.PICKER_TYPE_DATE,
    minDate:new Date(2009,0,1),
    maxDate:new Date(2014,11,31),
    value:new Date(2014,3,12)
});
var button = Titanium.UI.createButton({
   title: 'Picker',
   top: 10,
   width: 100,
   height: 50
});
button.addEventListener('click',function(e)
{
    picker.showDatePickerDialog({
        value: new Date(2010,8,1),
        callback: function(e) {
            if (e.cancel) {
                alert('User canceled dialog');
            } else {
                alert('User selected date: ' + e.value);
            }
        }
    });
});

///


var picker2 = Ti.UI.createPicker({
    type:Ti.UI.PICKER_TYPE_DATE,
    minDate:new Date(2009,0,1),
    maxDate:new Date(2014,11,31),
    value:new Date(2014,3,12),
    top:120
});
picker2.addEventListener('change',function(e){


    alert("User selected date: " + e.value.toLocaleString());


});

var button2 = Titanium.UI.createButton({
   title: 'Picker',
   top: 60,
   width: 100,
   height: 50
});
button2.addEventListener('click',function(e)
{
     alert('picker2.value: ' + picker2.value);
});

vidWin.add(button);
vidWin.add(picker2);
vidWin.add(button2);
vidWin.open();

[ashcoding]

Functionally tested. Accepted