Settings: Modify AOSP JA translation

usage_type_on_time is supposed to the cell standby use time(使用時間),
but it says screen use time(点灯時間) in Japanese. It should be corrected.

Change-Id: Ic9b7f61a054d09cf7944d6d37f70c8dbb294c095
Automatic translation import

Change-Id: I2db8cb59213162e87273d86fdc5189982578a776
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_packages_apps_Settings into android-4.4