Use charge_only_mode instead of charger

Change-Id: Iec947587e11a936505d71c0bc149d329b46f2cb1
liblights: notifications should have priority over the battery-state

also turn off blinking again, as a blinking battery-status is
distracting.

Change-Id: I07417d7f7c2cea580c97f39a19e620e1b1e9d0ea