Fix c tf turn error in low aspect demo file

[clmould]

Description

removed ixc=60 from low aspect ratio demo input file

Outputs:
low_aspect_ratio_DEMO_results.zip

Regression test failures:

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.51%. Comparing base (7c48754) to head (f5a9366).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4057   +/-   ##
=======================================
  Coverage   46.51%   46.51%           
=======================================
  Files         123      123           
  Lines       28802    28802           
=======================================
  Hits        13398    13398           
  Misses      15404    15404           

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[ajpearcey]

Looks good to me. not sure why the regression test is failing, is this because the number of iteration variables has changed.

[timothy-nunn]

There are two possible causes for the regression failure:

1. The removal of the iteration variable changes the path of the solver and it converges on a slightly different solution
2. The number of iteration variables has changed so the output ordering has changed this is because the iteration variable data in the MFile uses sequential numbers, not the iteration variable number.