Fix DQN target update frequency

[qgallouedec]

Description

Closes #322

Types of changes

• [x] Bug fix
• [ ] New feature
• [ ] New algorithm
• [ ] Documentation

Checklist:

• [x] I've read the CONTRIBUTION guide (required).
• [x] I have ensured pre-commit run --all-files passes (required).
• [ ] I have updated the documentation and previewed the changes via mkdocs serve.
• [ ] I have updated the tests accordingly (if applicable).

If you are adding new algorithm variants or your change could result in performance difference, you may need to (re-)run tracked experiments. See https://github.com/vwxyzjn/cleanrl/pull/137 as an example PR.

• [ ] I have contacted vwxyzjn to obtain access to the openrlbenchmark W&B team (required).
• [ ] I have tracked applicable experiments in openrlbenchmark/cleanrl with --capture-video flag toggled on (required).
• [ ] I have added additional documentation and previewed the changes via mkdocs serve.
  • [ ] I have explained note-worthy implementation details.
  • [ ] I have explained the logged metrics.
  • [ ] I have added links to the original paper and related papers (if applicable).
  • [ ] I have added links to the PR related to the algorithm variant.
  • [ ] I have created a table comparing my results against those from reputable sources (i.e., the original paper or other reference implementation).
  • [ ] I have added the learning curves (in PNG format).
  • [ ] I have added links to the tracked experiments.
  • [ ] I have updated the overview sections at the docs and the repo
• [ ] I have updated the tests accordingly (if applicable).

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[vwxyzjn]

Thanks @qgallouedec for this catch.