Definitions inside the models were usin the Bart R3F versions which we never actually open sourced. Regular old BART is pretty much the same though.

Test Plan:
On a completely fresh git clone of ParlAI only, run
```
parlai dm -mf zoo:tod/tod_base_no_api/model --skip-generation false  --task  google_sgd_simulation_splits:OutDomainSystemTeacher -dt valid
```

and

```
parlai dm -mf zoo:tod/tod_base_yes_api/model --skip-generation false  --task  google_sgd_simulation_splits:OutDomainSystemTeacher -dt valid --api-schemas true
```

Validate models load properly and don't have the `parlai_fb` thing