Add player overview extra

src/main/java/de/johni0702/minecraft/gui/element/AbstractGuiCheckbox.java

@@ -89,7 +89,7 @@ public abstract class AbstractGuiCheckbox<T extends AbstractGuiCheckbox<T>>
     @Override
     public void onClick() {
         getMinecraft().getSoundHandler().playSound(PositionedSoundRecord.create(BUTTON_SOUND, 1.0F));
-        checked = !checked;
+        setChecked(!isChecked());
         super.onClick();
     }