latona: zram disabled by default
latona: fix UMS issues

If acm is not enabled, only one of the storages is available as
USB mass storage device.
Get rid of the UMS only mode to quickly fix the problem.

Note: adb will be enabled all the time.
DeviceParts: BatteryWorkDelay improvements

1) Fix some copy and paste errors
2) Add description and improve the summary
3) Show wakelock duration instead of the additional delay