little change to be able to update just the value

While uploading a file I wanted to update circleProgress `value` in the onprogress handler of the uploadscript.
```
$('input[type=file]').fileupload({
    // ...
}).on('fileuploadadd', function(e, data) {
	// ....
	// here I init my circleProgress:
	$('#circle-progress').circleProgress({
		value: 0,
		size: 32,
		animation: false,
		fill: { gradient: ['#0681c4', '#07c6c1'] },
		startAngle: Math.PI * 1.5,
		thickness: 0
	});
}).on('fileuploadprogress', function(e, data) {
	// ...
	// here I just update the value:
	$('#circle-progress').circleProgress({
		value: progress
	});
});
```
Without this change the update call redraws the circleProgress with the defaults, now it uses the `data.options` where all previous options are stored...