sensor.esp32_linkquality (WiFi signal level) show as "rssi" instead of "dBm"

[Fabio Ancona]

Hello.
I see the "sensor.esp32_linkquality" (Entity in Home Assistant) that is the WiFi signal of ESP32 shown as "rssi".
I suggest to modify it to "dBm", since the "Unit of measurement" of signal (the values number returned) is "dBm".

Thanks!