Changed contextual notification panel headers

See images - http://i.imgur.com/PupEJ5p.jpg

Change-Id: If848d162523610946c317919d2f6664d891906e6
Base: fix Clock showing on lockscreen after reboot

how to reproduce

try enable center clock, and then reboot, you will see, clock is showing on lockscreen, and need to lock/unlock to hide again

user will not report this issue until they enabled center clock, and watch device reboot

Change-Id: I1a038bb258ad03bacfa4b528c2acbb030ab8b024