Size and position the donut.

Change-Id: I06801bfb342be6ded2743f12998371e1aee49ba9
Fixes: 36224169
Test: Manual

src/com/android/settings/widget/DonutView.java

@@ -44,7 +44,7 @@ public class DonutView extends View {
     public DonutView(Context context, AttributeSet attrs) {
         super(context, attrs);
         float density = getResources().getDisplayMetrics().density;
-        mStrokeWidth = 10f * density;
+        mStrokeWidth = 6f * density;
 
         mBackgroundCircle = new Paint();
         mBackgroundCircle.setAntiAlias(true);