enabled setInsecure() for ESP32 (#251)

Previously a call to this method had to be omitted, it was only required for ESP8266.
Out of a debugging session ended up with the broker refusing connections so I enabled `insecure` mode and it now works

Author: ubidefeo

src/ArduinoIoTCloudTCP.cpp

@@ -207,10 +207,8 @@ int ArduinoIoTCloudTCP::begin(bool const enable_watchdog, String brokerAddress,
   _sslClient.setClient(_connection->getClient());
   _sslClient.setEccSlot(static_cast<int>(ECCX08Slot::Key), _eccx08_cert.bytes(), _eccx08_cert.length());
   #elif defined(BOARD_ESP)
-  #ifndef ESP32
   _sslClient.setInsecure();
   #endif
-  #endif
 
   _mqttClient.setClient(_sslClient);
   #ifdef BOARD_ESP