Fix crash with dangling player pointer

For a more educated fix would need to get access to git history for why the hook was moved here.
Or alternatively, try research what would be the correct place for the hook.

src/server/game/Maps/Map.cpp

@@ -815,8 +815,8 @@ void Map::RemovePlayerFromMap(Player* player, bool remove)
 
     if (remove)
     {
-        DeleteFromWorld(player);
         sScriptMgr->OnPlayerLeaveMap(this, player);
+        DeleteFromWorld(player);
     }
 }