[TIMOB-2627] Android: Menu icons don't fetch density images

To reproduce:

app.js

Titanium.UI.setBackgroundColor('#000');
Titanium.UI.createWindow({  
    title:'Test',
    backgroundColor:'#fff',
    fullscreen: true,
    exitOnClose: true,
    url: 'win.js'
}).open();

Then make this win.js:

var win = Ti.UI.currentWindow;
Ti.Android.currentActivity.onCreateOptionsMenu = function(e) {
    var m1 = e.menu.add({
        itemId : 1,
        groupId : 0,
        order : 0,
        title: 'I am first'
    });
    m1.setIcon("images/test.png");
    var m2 = e.menu.add({
        itemId : 2,
        groupId : 0,
        order : 1,
        title: 'I am second'
    });
    m2.setIcon("KS_nav_ui.png");
};

Then ...

• Create Resources/android/images/medium
• Copy KS_nav_ui.png to Resources/android/images/medium/test.png (but also keep KS_nav_ui.png in Resources)

Run the app. When the blank window comes up, press the emulator/phone menu button. You should see two menu items, both of which show icons on them. But only one of them ('I am second') will have the icon.