Fix example script

[willGraham01]

Context

Updates examples/arc_01 so that it runs and produces an output. The example had been neglected with the update to iteratefdtd_matrix.

• Fixes #316

I wanted to get MATLAB to also run the demonstration script, but it is not as simple as passing the script to the matlab-actions/run-command@v1 action because:

• We don't install tdms in the current CI version
• MATLAB's system command cannot locate the tdms executable without it being in the system path.

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (abf505a) 25% compared to head (b756591) 25%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #320 +/- ## =================================== Coverage 25% 25% =================================== Files 66 66 Lines 3607 3607 =================================== Hits 908 908 Misses 2699 2699 ```

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