Settings: Fix isPackageInstalled logic.

    - If package is null, isPackageInstalled returned true.
    - Return false if null, always.
    - PS2: Fix codestyle
Change-Id: If2bf41e4c9520195d56e327a447d7085daab3154
Hide "Volume adjustment sound" option on non-voice capable devices

On non-voice capable devices, there's no sound when adjusting the
notification volume. Remove the obsolete option from Settings.

Change-Id: I3fc9ef737eb55d591a4ecc7d79ee60b9151395b5
Settings : Launch only contacts picker for blacklist entry

Change-Id: I266d1ad7f1aab745728b33490268cb197188f2b3
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