[strand-radio] disabled not working via js

[dlasky]

The disabled property on the radio button does not seem to be exposed. However, it works for the html attribute. Can be reproduced with the sample code on the component page

http://strand.mediamath.com/strand-radio.html:

<strand-radio group="aces" unresolved>
    <label>My Label 1</label>
</strand-radio>
<strand-radio id="test" group="aces" unresolved>
    <label>My Label 2</label>
</strand-radio>
<strand-radio group="aces" unresolved>
    <label>My Label 3</label>
</strand-radio>
<strand-radio group="aces" checked="true" disabled="true" unresolved>
    <label>My Label 4</label>
</strand-radio>

<script>
    var button = document.getElementById('test');
    button.checked = true;
    button.disabled = true;
</script>```

via @sassomedia