Fixed|libcommon: Shutdown during finale caused fatal error

When the finale stack was cleared, GUI widgets were accessed via a hook
function for script stopping. Now GUI widgets are destroyed later
during the libcommon shutdown, resolving the error situation.

doomsday/plugins/common/src/g_game.c

@@ -994,11 +994,10 @@ void G_CommonShutdown(void)
     P_Shutdown();
     G_ShutdownEventSequences();
 
+    FI_StackShutdown();
     Hu_MenuShutdown();
     ST_Shutdown();
     GUI_Shutdown();
-
-    FI_StackShutdown();
 }
 
 /**