Properly enable font smoothing in loading screen too (this may not work unless you have a patched irrlicht)

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@8484 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/guiengine/engine.cpp

@@ -1102,6 +1102,7 @@ namespace GUIEngine
                                             true /* alpha */);
         
         
+        irr_driver->getVideoDriver()->enableMaterial2D(); // seems like we need to remind irrlicht from time to time to use the Material2D
         g_title_font->draw(_("Loading"),
                            core::rect< s32 >( 0, screen_h/2 + texture_h/2,
                                               screen_w, screen_h ),