[TIMOB-23283] Windows: ProgressBar Ti.UI.FILL does not display the bar correctly

Setting the ProgressBar width property to Ti.UI.FILL does not display the same behaviour on Windows Phone, as it does on iOS / Android. *This affects both device & emulator.*

TEST CODE:

var pb = Ti.UI.createProgressBar({
    min: 0,
    max: 10,
    value: 0,
    color: 'blue',
    backgroundColor: 'green',
    backgroundDisabledColor: 'gray',
    message: 'Downloading 0 of 10',
    width: Ti.UI.FILL
});
var win = Ti.UI.createWindow();
win.add(pb);
win.open();
pb.show();

Steps to Reproduce

1. Create a classic mobile application. 2. Apply test code to app.js file. 3. Deploy app to Windows 10 phone device / emualator. 4. Launch app

Actual Result

_see windows phone screenshot_ Progress Bar is aligned to the left, and does not fill the width of the window.

Expected Result

_see iPhone screenshot_ Progress Bar should fill the entire width of the window.