fix to write_csv typing and removed extra indent for adding col_names

[kj5248]

Linked Issues

Closes #3533

Description

Removed extra indent and fixed typing in write_csv

Checklist

I confirm that I have completed the following checks:

• [ ] Tests run locally and pass pytest tests --reactor
• [ ] Code quality checks run locally and pass pre-commit run --from-ref develop --to-ref HEAD
• [ ] Documentation built locally and checked sphinx-build -W documentation/source documentation/build

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 76.38%. Comparing base (5052f20) to head (1e04e8c). Report is 1 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #3534 +/- ## ======================================== Coverage 76.38% 76.38% ======================================== Files 230 230 Lines 26640 26640 ======================================== Hits 20349 20349 Misses 6291 6291 ```

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[github-actions[bot]]

⚠️ Warning Report

Found 0 new warnings, 0 fixed warnings. 🎉

All warnings (7)

#### On runtest - `/home/runner/miniconda3/envs/bluemira/lib/python3.10/site-packages/ffcx/element_interface.py:26: DeprecationWarning: Converting elements created in UFL to Basix elements is deprecated. You should create the elements directly using basix.ufl.element instead` - `/home/runner/miniconda3/envs/bluemira/lib/python3.10/site-packages/basix/ufl.py:1909: DeprecationWarning: Converting elements created in UFL to Basix elements is deprecated. You should create the elements directly using basix.ufl.element instead` - `/home/runner/work/bluemira/bluemira/bluemira/radiation_transport/radiation_tools.py:731: DeprecationWarning: `interp2d` is deprecated! `interp2d` is deprecated in SciPy 1.10 and will be removed in SciPy 1.12.0. For legacy code, nearly bug-for-bug compatible replacements are `RectBivariateSpline` on regular grids, and `bisplrep`/`bisplev` for scattered 2D data. In new code, for regular grids use `RegularGridInterpolator` instead. For scattered data, prefer `LinearNDInterpolator` or `CloughTocher2DInterpolator`. For more details see `https://gist.github.com/ev-br/8544371b40f414b7eaf3fe6217209bff` ` - `/home/runner/miniconda3/envs/bluemira/lib/python3.10/site-packages/ffcx/element_interface.py:23: DeprecationWarning: Use of elements created by UFL is deprecated. You should create elements directly using Basix.` - `/home/runner/work/bluemira/bluemira/bluemira/equilibria/optimisation/harmonics/harmonics_approx_functions.py:41: RuntimeWarning: divide by zero encountered in log10` - `/home/runner/miniconda3/envs/bluemira/lib/python3.10/site-packages/ufl/core/expr.py:275: DeprecationWarning: Expr.ufl_domain() is deprecated, please use extract_unique_domain(expr) instead.` #### On collect - `/home/runner/miniconda3/envs/bluemira/lib/python3.10/site-packages/ufl/core/ufl_type.py:56: DeprecationWarning: attach_operators_from_hash_data deprecated, please use UFLObject instead.`