fix PIHTTPClient with queryArguments

libs/http_client/pihttpclient.cpp

@@ -59,7 +59,7 @@ bool PIHTTPClient::init() {
 	if (is_cancel) return false;
 	CurlThreadPool::instance();
 	if (!PRIVATE->init()) return false;
-	auto ait = request.arguments().makeIterator();
+	auto ait = request.queryArguments().makeIterator();
 	while (ait.next()) {
 		if (!url.contains('?'))
 			url.append('?');