[TIMOB-11735] BlackBerry: Titanium.UI.Window/Titanium.UI.View backgroundImage and backgroundColor exclude each other.

Setting *backgroundImage* and *backgroundColor* in the same time to the window will leave only the last in the code: This will show only the image:

var win = Ti.UI.createWindow({
	backgroundColor:'#f00',
	backgroundImage:'/sun.png'
});

win.open();

This will show only the red background:

var win = Ti.UI.createWindow({
	backgroundImage:'/sun.png',
	backgroundColor:'#f00'
});

win.open();

Exactly the same for Ti.UI.View.