[TIMOB-26512] Android: setting one of the color states may break the default background

Defining only a "special" color state (backgroundFocusedColor, backgroudDisabledColor or backgroundSelectedColor) without the default backgroundColor for a View results in a view with a transparent background. This is sort of a "partial regression" meaning that 7.5.0 exposed it through the backgroundDisabledColor fix, but it was the same for the other two properties before that. sample:

var win = Ti.UI.createWindow(),
    button = Ti.UI.createButton({
        backgroundSelectedColor: 'red',
        title: 'Button',
        width: 100,
        height: 100
    });

win.add(button);
win.open();