change back to cwd to avoid being stuck in examples temp dir

[clmould]

Description

When running pytest the regression tests were failing:

This happened because it was stuck in the examples temp dir

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 48.83%. Comparing base (aada716) to head (8caaba4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4381   +/-   ##
=======================================
  Coverage   48.83%   48.83%           
=======================================
  Files         151      151           
  Lines       29376    29376           
=======================================
  Hits        14347    14347           
  Misses      15029    15029           

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[timothy-nunn]

Superseded by #4384