This is a coding task, for this task you will need to have a Haiku build environment setup, and be able to compile Haiku to test to see if your fix works.

Read in bluetooth preferences Statup the Device Class and Discovery mode, and update UI.

The given UI elements should be updated according to the initial status of the device:

http://cgit.haiku-os.org/haiku/tree/src/preferences/bluetooth/ExtendedLocalDeviceView.cpp

fDiscoverable = new BCheckBox(...)

http://cgit.haiku-os.org/haiku/tree/src/preferences/bluetooth/BluetoothSettingsView.cpp

fLocalDevicesMenuField = new BMenuField(...)