fix splash window visibility

direct/src/plugin/p3dSplashWindow.cxx

@@ -88,7 +88,6 @@ set_wparams(const P3DWindowParams &wparams) {
   _wparams = wparams;
   _win_width = _wparams.get_win_width();
   _win_height = _wparams.get_win_height();
-  _visible = true;
 }
 
 ////////////////////////////////////////////////////////////////////

direct/src/plugin/p3dX11SplashWindow.cxx

@@ -94,7 +94,7 @@ set_visible(bool visible) {
   TiXmlDocument doc;
   TiXmlElement *xcommand = new TiXmlElement("command");
   xcommand->SetAttribute("cmd", "set_visible");
-  xcommand->SetAttribute("visible", (int)visible);
+  xcommand->SetAttribute("visible", (int)_visible);
   doc.LinkEndChild(xcommand);
   write_xml(_pipe_write, &doc, nout);
 }