Scripts/Player: Add OnMapChanged to PlayerScripts (after map changed)

Core/Dungeon Finder: Use OnMapChanged script to cast/remove Luck of the draw
- Also move code to force party update to LfgPlayerScript
- Remove some obsolete Lfg code after recent commits

src/server/game/Scripting/ScriptMgr.cpp

@@ -580,6 +580,8 @@ void ScriptMgr::OnPlayerEnterMap(Map* map, Player* player)
     ASSERT(map);
     ASSERT(player);
 
+    FOREACH_SCRIPT(PlayerScript)->OnMapChanged(player);
+
     SCR_MAP_BGN(WorldMapScript, map, itr, end, entry, IsWorldMap);
         itr->second->OnPlayerEnter(map, player);
     SCR_MAP_END;