Don't clear authentication options on a ::stop (#5386)

Many objects now expect a WiFiClient* object to be passed to them and
potentially re-used multiple times (HTTPClient, others).  Clearing the
authentication options on a ::stop means they can never reconnect.

Remove the option clearing in ::stop

Fixes #5379

Author: earlephilhower

libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp

@@ -189,7 +189,6 @@ bool WiFiClientSecure::stop(unsigned int maxWaitMs) {
     if (_session) {
       br_ssl_engine_get_session_parameters(_eng, _session->getSession());
     }
-    _clearAuthenticationSettings();
   }
   _freeSSL();
   return ret;