Improve support for Heltec Wireless Bridge (#6647)

* Use BLE_LED where present for CONNECTED/DISCONNECTED

* Use WIFI_LED where present for WiFi started/stopped (as AP) or connected/disconnected (as Station)

* improve support for Heltec Wireless Bridge

* satisfy 'trunk fmt'

src/nimble/NimbleBluetooth.cpp

@@ -171,6 +171,11 @@ void NimbleBluetooth::deinit()
 {
 #ifdef ARCH_ESP32
     LOG_INFO("Disable bluetooth until reboot");
+
+#ifdef BLE_LED
+    digitalWrite(BLE_LED, LOW);
+#endif
+
     NimBLEDevice::deinit();
 #endif
 }