Fixed BLE pin code gets ignored

[lincomatic]

In the companion_radio_ble build, the a fixed BLE pin code gets ignored if the device previously was flashed with a dynamic pin code. I flashed a build with display support into a device by accident. Subsequently, flashed a build with BLE_PIN_CODE defined to be nonzero, and it was still generating dynamic pin codes (which I couldn't see, because the device had no display).

The offending code is in main.cpp:

  #ifdef BLE_PIN_CODE
    if (_prefs.ble_pin == 0) {
    #ifdef DISPLAY_CLASS
      _active_ble_pin = trng.nextInt(100000, 999999);  // random pin each session
    #else
      _active_ble_pin = BLE_PIN_CODE;  // otherwise static pin
    #endif
    } else {
      _active_ble_pin = _prefs.ble_pin;
    }
  #else
    _active_ble_pin = 0;
  #endif` 

Note than if _prefs.ble == 0, it ignores BLE_PIN_CODE.

[liamcottle]

Looks like this was fixed in #426