[lightswitch] - Update widget.js to use g.getBgColor for inner bulb when off

apps/lightswitch/widget.js

@@ -57,7 +57,8 @@
         );
       } else {
         // backlight off
-        g.setColor(0);
+        let innerColorWhenOff = g.getBgColor();
+        g.setColor(innerColorWhenOff);
       }
       // draw circle
       g.drawImage(atob("CwuBAB8H8f9/////////f8fwfAA="), this.x + 6, this.y + 6);