make Spin the default mode again

dwss.cc

@@ -32,7 +32,10 @@ static bool update (GnomeScreensaver & gs)
 
 static Mode *getMode(GnomeScreensaver & gs)
 {
+#if 0
     return new Starfield(gs);
+#endif
+    return new Spin();
 }
 
 int main (int argc, char *argv[])