Adapt keyguard widget to new button margins.

Assures a nice transition when invoking the camera from the keyguard.

Change-Id: I4a2478c32ec54af76cf0c18e7f62b68baa8bb519
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_packages_apps_Camera2 into cm-11.0