Fix leak in HTTPSClient (#2256)

Fixes #2254

The faked certificate was allocated but not deleted in certain cases.  Make sure
to clean up in the destructor.

libraries/HTTPClient/src/HTTPClient.h

@@ -179,7 +179,11 @@ typedef std::vector<Cookie> CookieJar;
 class HTTPClient {
 public:
     HTTPClient() = default;
-    ~HTTPClient() = default;
+    ~HTTPClient() {
+        if (_clientMade) {
+            delete _clientMade;
+        }
+    }
     HTTPClient(HTTPClient&&) = default;
     HTTPClient& operator=(HTTPClient&&) = default;