fix(Http): use uninitialize_curl() in begin() method

winixd/utils/http.cpp

@@ -46,6 +46,7 @@ namespace Winix
 
 Http::Http()
 {
+	curl = nullptr;
 	begin();
 }
 
@@ -55,7 +56,7 @@ Http::Http()
  */
 Http & Http::begin()
 {
-	curl = nullptr;
+	uninitialize_curl();
 	synchro = nullptr;
 	browser_name = "Winix";
 	conn_timeout = 30;