[DISC] Whitelist immediate change

[benzok]

Today when adding a BLE device that is auto discovered you need to temporarily disable the white-list first and then add the new device to the list, as described in the docs.

With this change you just update the list and it gets discovered. (You need to restart the gateway if you have not enabled discovery)

See discussion in Theengs community

The PR has been built and tested on environment esp32-lolin32lite-ble

Checklist:

• [ x] The pull request is done against the latest development branch
• [ x] Only one feature/fix was added per PR and the code change compiles without warnings
• [ x] I accept the DCO.

[DigiH]

Thanks @benzok , also for amending the documentation, but the optional commands how to temporarily disable or enable white/black lists need to remain, as these are still useful working commands.

Just the top paragraph about this being required for new white-list discoveries can go.

[1technophile]

Thanks