Updated Security Sprites

For reference: https://github.com/tgstation/-tg-station/pull/2984

Updates the Security Armour and Helmet sprites, mainly to get rid of the "Biker" attribute and to cover more of the body.

From this thread: http://www.ss13.eu/phpbb/viewtopic.php?f=42&t=4157

Image
![](http://i.imgur.com/xav6mkK.gif)