CellBroadcastReceiver: Update ActionBar to match Settings

Even though CellBroadcastReceiver is a seperate app, it is accessed
directly in the Settings app and has an action bar style different to
all the screens in the Settings app.

Change-Id: I8e8b8bd0fa7094b159d68bd1a4ec269821480764
CellBroadcastReceiver: Add missing up navigation

Change-Id: I2e380542fbb9b26c77b75040af7982c142b592fc