settings: fix battery stats

* Use the new dock stats parcelable creator

Change-Id: I4f1ac0b2b7181f0c9c023795acf1671f7b9e9820
JIRA: CYAN-3127
Issue: https://jira.cyanogenmod.org/browse/CYAN-3127
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>