Fix use of GB.Wait().

[GB.GTK3.WEBVIEW]
* BUG: Fix use of GB.Wait().

[GB.QT5.WEBVIEW]
* BUG: Fix use of GB.Wait().

gb.gtk3/src/webview/c_webview.c

@@ -393,7 +393,7 @@ BEGIN_METHOD(WebView_ExecJavascript, GB_STRING script)
 	webkit_web_view_run_javascript(WIDGET, script, NULL, (GAsyncReadyCallback)cb_javascript_finished, (gpointer)THIS);
 	
 	while(THIS->js_running)
-		GB.Wait(0);
+		GB.Wait(-1);
 	
 	if (THIS->js_error)
 	{

gb.qt5/src/webview/c_webview.cpp

@@ -447,7 +447,7 @@ BEGIN_METHOD(WebView_ExecJavascript, GB_STRING script)
 	WIDGET->page()->runJavaScript(QSTRING_ARG(script), cb_javascript_finished);
 	
 	while(_js_running)
-		GB.Wait(0);
+		GB.Wait(-1);
 
 	if (_js_error)
 	{