Use `getOpenStateMap()` in PlayerOpenStateManager

src/main/java/emu/grasscutter/game/player/PlayerOpenStateManager.java

@@ -44,11 +44,11 @@ public class PlayerOpenStateManager extends BasePlayerDataManager {
     }
 
     public int getOpenState(OpenState openState) {
-        return this.map.getOrDefault(openState.getValue(), 0);
+        return getOpenStateMap().getOrDefault(openState.getValue(), 0);
     }
 
     public void setOpenState(OpenState openState, Integer value) {
-        Integer previousValue = this.map.getOrDefault(openState.getValue(),0);
+        Integer previousValue = getOpenStateMap().getOrDefault(openState.getValue(),0);
         if (value != previousValue) {
             this.map.put(openState.getValue(), value);
             player.getSession().send(new PacketOpenStateChangeNotify(openState.getValue(),value));