fix(Core/Instance): Fix instance resetting exploit (#2172)

* fix(Core/Instance): Fix instance resetting exploit

- Fix issue with instance reset exploit

Co-Authored-By: Lee <talamortis@users.noreply.github.com>

* Added another check

Added a check to see if any players are in the current instance before teleporting the player to the entrance.

src/server/game/Server/WorldSession.cpp

@@ -566,6 +566,12 @@ void WorldSession::LogoutPlayer(bool save)
         {
             _player->GetGroup()->SendUpdate();
             _player->GetGroup()->ResetMaxEnchantingLevel();
+			
+            Map::PlayerList const &playerList = _player->GetMap()->GetPlayers();
+
+            if (_player->GetMap()->IsDungeon() || _player->GetMap()->IsRaidOrHeroicDungeon())
+                if (playerList.isEmpty())
+                    _player->TeleportToEntryPoint();
         }
 
         //! Broadcast a logout message to the player's friends