Closes fireplace when re-entering house

This closes the fireplace behind you when you enter the house from the lab.  Before this the music would play and the door would do nothing (sometimes it would open).

I'm not sure if I should have used a deepcopy so if someone has an opinion on what that might break, that part can be changed.

Also I couldn't test what this does to the greendale door since I have no idea how to trigger it, but other than that this is complete and working.