Adds onDisconnect() BLE param (espressif#7851)

Author: SuGlider

libraries/BLE/src/BLEServer.cpp

@@ -207,6 +207,7 @@ void BLEServer::handleGATTServerEvent(esp_gatts_cb_event_t event, esp_gatt_if_t
 case ESP_GATTS_DISCONNECT_EVT: {
 if (m_pServerCallbacks != nullptr) { // If we have callbacks, call now.
 m_pServerCallbacks->onDisconnect(this);
+m_pServerCallbacks->onDisconnect(this, param);
 }
  if(m_connId == ESP_GATT_IF_NONE) {
  return;