acpi: use the original way to suspend

zzz is not shipped with acpid package by default anymore

roles/acpi/files/handler.sh

@@ -13,17 +13,17 @@ button/power:PWRF:* | button/power:PBTN:*)
 button/sleep:SLPB:*)
 	log 'Sleep button pressed'
 	# Suspend to RAM.
-	zzz
+	echo mem > /sys/power/state
 ;;
 button/lid:*:close:*)
 	log 'Lid closed'
 	# Suspend to RAM if AC adapter is not connected.
-	[ "$(power-supply -d adapter -s)" = "offline" ] && zzz
+	[ "$(power-supply -d adapter -s)" = "offline" ] && echo mem > /sys/power/state
 ;;
 ac_adapter:*:*:*0)
 	log 'AC adapter unplugged'
 	# Suspend to RAM if notebook's lid is closed.
-	lid-state -c && zzz
+	lid-state -c && echo mem > /sys/power/state
 ;;
 esac