[TIMOB-15099] Android: borderRadius does not adhere to defaultunit

To reproduce

Create a new app

Replace the code in app.js by:

    var w = Ti.UI.createWindow({
        backgroundColor: 'white',
        modal: false
    });
    var v = Ti.UI.createView({
        backgroundColor: 'red',
        borderRadius: 150,
        width: 300,
        height: 300,
        borderWidth: 100,
        borderColor: 'black'
    });
    w.add(v);
    w.open();
    

Run the app on both iOS and Android and the result will be like screenshots 1 and 2.

Now set the default unit to dp by adding this to the tiapp.xml:

    <property name="ti.ui.defaultunit" type="string">dp</property>
    

Run the app on both platforms again and the result will be like screenshots 1 and 3. As you can see because of the DPI of the tested device the border radius is about half of what we expected.