Fixed Bluetooth renaming bug.

+ After renaming your Bluetooth device, the title of the Bluetooth
    Activity stays "Bluetooth" instead of changing to the new name.
+ After renaming the device, the status at the bottom Bluetooth Settings
    is correctly displayed.

Bug: 16463239
Change-Id: Ifb12df2004fe1f89bd6f918e23c2c64ae08a0191