Update Icons In Settings

- Some icons are either too small or too big and some were darker then others, this solves that.

http://i.imgur.com/yTthGsO.png
http://i.imgur.com/g9L5HpP.png
http://i.imgur.com/UQ9JWNd.png
http://i.imgur.com/ABtFrdO.png

Change-Id: I4c03bb004fe2dc46ed60ed7a093e9dd455e7a452