So I got an xperia L3 a couple of weeks ago now, love the phone, one thing has been bugging me for the past couple of days though, my notification panel, which had a white background at the time of purchase, randomly changed to a black background, and the icons, which used to be black, are now white, no other colours on the device or any of the software installed on it are affected, just the notification panel and the icons it houses, how do I get it back to its original appearance without installing a third party ap