release wish history memory

The memory leak only happened at end of game so wasn't a big deal.

src/save.c

@@ -1111,6 +1111,7 @@ freedynamicdata(void)
     cmdq_clear(CQ_REPEAT);
     cmdbind_freeall();
     free_tutorial(); /* (only needed if quitting while in tutorial) */
+    wish_history_flush();
 
     /* per-turn data, but might get added to when freeing other stuff */
     dobjsfree(); /* really free deleted objects */