ThemeManager: Update previews to KitKat

I have updated the previews to look just like how our CM11 builds are.
They both have same style as old ones but with KK look.

To take a quick look at theme:
drawable: http://postimg.org/image/5p75sb0jb/
drawable-land: http://postimg.org/image/wlmjmvtyv/

Change-Id: Icf8d9812100c86cdfebfd6addb778b3c65643650