Fix translation no_trainer
# What does this PR do?

This PR fixes the reason translation has been failing, by adding in the same `num_beams` that were found to be used in the test.

Fixes # (issue)


## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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      Pull Request section?
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- [ ] Did you make sure to update the documentation with your changes? Here are the
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- [ ] Did you write any new necessary tests?


## Who can review?

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@sgugger, cc @ydshieh 
_The documentation is not available anymore as the PR was closed or merged._<|||||>@sgugger it hasn't and has been failing for some time, due to the fact `num_beams` was `None` (the default in the CLI), and we need to pass it in. When checking the diff/blame there was not anything explicitly that changed in this file to have this happen, however this is the fix that is needed for the test to pass. <|||||>Ah ok, got confused because it's slow.