fix: remove dash from model ID while exporting to SMBL format

[JonathanRob]

The dash in the model ID Human-GEM causes problems with SBML I/O, so this fix removes the dash (HumanGEM) in only the SBML file. The model ID will remain as Human-GEM everywhere else.

I hereby confirm that I have:

• Selected devel as a target branch

[mihai-sysbio]

Nice fix! Would it make sense to also rename the .yml file to Human-GEM.yml?

[JonathanRob]

@mihai-sysbio Yes, it would probably be a good idea to change the model filenames as well to be consistent. We just need to make sure that the names of all other model versions (.xml, .mat, etc.) and all functions reading/writing these files are also updated.

[haowang-bioinfo]

yes, we could add a project "Aligning model filenames with ID of repo and model" to coordinate efforts toward this goal, probably through multiple commits/PRs.

[JonathanRob]

@Hao-Chalmers I think creating an issue is sufficient, it's not a big enough change to be considered a "project."