Fix Duplicate Glycerol-3-Phosphate Dehydrogenase Reactions

[Devlin-Moyer]

Main improvements in this PR:

As proposed at the end of the discussion in #599:

• Removes MAR00478 because there's no evidence that GPD1 or GPD1L can use NADP(H) in addition to NAD(H)
• Removes MAR00482 because GPD2 is definitely localized to the inner mitochondrial membrane, so it should use FAD(H2) [m] and not [c]

Also while not explicitly proposed in #599:

• Merges annotations for MAR00478 in reactions.tsv and its associated reference with those for MAR00479, since they're nearly identical reactions
• Merges annotations for MAR00482 in reactions.tsv into those for MAR01169, since, again, they're nearly identical reactions

I hereby confirm that I have:

• Tested my code on my own computer for running the model
• Selected develop as a target branch
• Any removed reactions and metabolites have been moved to the corresponding deprecated identifier lists

[feiranl]

LGTM!