Ensure dipoles get a unique name

[Hespe]

Description

Removes an unnecessary name assignment within the dipole element to ensure all accelerator elements are assigned unique names if none are provided.

Motivation and Context

Closes #181

• [x] I have raised an issue to propose this change (required for new features and bug fixes)

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation (update in the documentation)

Checklist

• [x] I have updated the changelog accordingly (required).
• [ ] My change requires a change to the documentation.
• [x] I have updated the tests accordingly (required for a bug fix or a new feature).
• [ ] I have updated the documentation accordingly.
• [x] I have reformatted the code and checked that formatting passes (required).
• [x] I have have fixed all issues found by flake8 (required).
• [x] I have ensured that all pytest tests pass (required).
• [ ] I have run pytest on a machine with a CUDA GPU and made sure all tests pass (required).
• [x] I have checked that the documentation builds (required).

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[Hespe]

I checked all other elements as well and none seem to have the same unnecessary overwrite. Not sure though which line in quadrupole.py you meant in #181, @jank324?

[jank324]

I think I meant dipole.py. It was late and I was working on multiple issues at the same time. 😄