(svn r6694) -Fix: FS#361 Refit-to Order bug (only one of the two bugs mentioned there)

-Now refit orders are copied when copying orders
   -Fixed an initilation issue where CT_INVALID was used instead of CT_NO_REFIT (resulted in crashes in the order window)
   -Fixed a compiler warning in the function to load TTD savegames

order.h

@@ -191,7 +191,7 @@ static inline Order UnpackOrder(uint32 packed)
 	order.dest    = GB(packed, 16, 16);
 	order.next    = NULL;
 	order.index   = 0; // avoid compiler warning
-	order.refit_cargo   = CT_INVALID;
+	order.refit_cargo   = CT_NO_REFIT;
 	order.refit_subtype = 0;
 	return order;
 }