FODCircleView: Add support for custom FP pressed icon

* For those devices which were calibrated to use
  non-solid color icons, add the icon in overlay.

Change-Id: If357b8eb0da17b1ea97a2ab5ca880d465c33adc9

Author: TheScarastic

packages/SystemUI/res/drawable-nodpi/fod_icon_pressed.png

@@ -201,6 +201,7 @@ protected void onDraw(Canvas canvas) {
                 super.onDraw(canvas);
             }
         };
+        mPressedView.setImageResource(R.drawable.fod_icon_pressed);
 
         mWindowManager.addView(this, mParams);