Fix WiFiClientSecure implicit default copy ctor

These both use shared-ptrs to handle refcnts to allocated data, so using
the default copy constructor is fine (and has been in use for a long
time).

Author: earlephilhower

libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.h

@@ -37,6 +37,8 @@ class WiFiClientSecure : public WiFiClient {
     WiFiClientSecure(const WiFiClientSecure &rhs);
     ~WiFiClientSecure() override;
 
+    WiFiClientSecure& operator=(const WiFiClientSecure&) = default; // The shared-ptrs handle themselves automatically
+
     int connect(IPAddress ip, uint16_t port) override;
     int connect(const String& host, uint16_t port) override;
     int connect(const char* name, uint16_t port) override;

libraries/ESP8266WiFi/src/WiFiServerSecureBearSSL.h

@@ -62,6 +62,8 @@ class WiFiServerSecure : public WiFiServer {
     void setServerKeyAndCert(const uint8_t *key, int keyLen, const uint8_t *cert, int certLen);
     void setServerKeyAndCert_P(const uint8_t *key, int keyLen, const uint8_t *cert, int certLen);
 
+    WiFiServerSecure& operator=(const WiFiServerSecure&) = default;
+
   using ClientType = WiFiClientSecure;
 
   private: