Fix type hints in RandomMotion

[blakedewey]

Description

Fix type hints in the RandomMotion __init__ method, which should allow for tuples of floats in degrees and translation. This type hint now matches the docstring.

Checklist

• I have read the CONTRIBUTING docs and have a developer setup (especially important are pre-commitand pytest)
• Non-breaking change (would not break existing functionality)
• Breaking change (would cause existing functionality to change)
• Tests added or modified to cover the changes
• Integration tests passed locally by running pytest
• In-line docstrings updated
• Documentation updated, tested running make html inside the docs/ folder
• This pull request is ready to be reviewed

[fepegar]

Thanks, @blakedewey. I've suggested some changes.

[fepegar]

@all-contributors please add @blakedewey for doc

[allcontributors]

@fepegar

I've put up a pull request to add @blakedewey! 🎉