message: fix webserver pointer
diff: @@ -211,7 +211,7 @@ class WiFiManager
  private:
  std::unique_ptr<DNSServer> dnsServer;
  - #if defined(ESP32) && defined(WEBSERVERSHIM)
  + #if defined(ESP32) && defined(WM_WEBSERVERSHIM)
  using WM_WebServer = WebServer;
  #else
  using WM_WebServer = ESP8266WebServer;
  