Device Discoverability not set properly when Bluetooth is toggled

Issue:
When BT is turned off/on staying in the same BT Settings
screen discoverability was not set again.

Fix:
Handle setting discoverability Bluetooth state change
intents also when BT state is  turned ON.

Bug: 21944289
Change-Id: Ic3c8d476c53673b21d40ea2bd9669758d89c2aee