[TIMOB-1539] Android: selectedBackgroundColor behavior incorrect (TableViewRow)

(Probably should be done in concert with #1509 re selectedBackgroundImage).

Using this test app.js:

Titanium.UI.setBackgroundColor('#000');

var w = Ti.UI.createWindow({fullscreen: true});
var data = [];
for (var i = 0; i < 10; i++) {
    var color = (i % 2) ? 'red' : 'blue';
    data.push(Ti.UI.createTableViewRow({
        selectedBackgroundColor: color, 
        title: 'Row ' + (i + 1)
    }));
};
var tv = Ti.UI.createTableView({
    data: data
});
w.add(tv);
w.open();

In iOS, if you touch one of the rows, it's selectedBackgroundColor will show until you finish the touch. In Android, if you touch one of the rows then the default orange-ish background appears. If you use the hardware scroll to scroll down the list (which selects each row one-at-a-time as you scroll), each row's selectedBackgroundColor will then appear, but then not disappear when you move to the next row. (So, using the example above, you end up with a red-blue-red-blue-red-blue etc. table by the time you get to the bottom row.)