Fixes
```
Nov 08 21:41:14 homeassistant homeassistant[474]: /usr/src/homeassistant/homeassistant/components/bluetooth/util.py:39: FutureWarning: BLEDevice.rssi is deprecated and will be removed in a future version of Bleak, use AdvertisementData.rssi instead
Nov 08 21:41:14 homeassistant homeassistant[474]: rssi=history.device.rssi,
```
* Hide bluetooth passive option if its not available
- We now have a way to determine in advance if passive
scanning is supported by BlueZ
* drop string
