fixed typo in tde_photosphere.py
fixed typo in tde_photosphere.py

mnicholl/MOSFiT,villrv/MOSFiT,bmockler/MOSFiT,villrv/MOSFiT,guillochon/MOSFiT,bmockler/MOSFiT,guillochon/MOSFiT,mnicholl/MOSFiT,guillochon/FriendlyFit,guillochon/MOSFiT,mnicholl/MOSFiT