🩹 Fix 'setup_case_study' when used with 'results_folder_root'

[s-weigand]

When using setup_case_study with results_folder_root, the output_folder_name is ignored.

This slipped because in the examples results_folder_root is always None (uses user home folder) and the test was wrong.

Change summary

• 🩹 Also use output_folder_name when results_folder_root not None

Checklist

• ✔️ Passing the tests (mandatory for all PR's)
• 🧪 Adds new tests for the feature (mandatory for ✨ feature and 🩹 bug fix PR's)

[github-actions]

👈 Launch a binder notebook on branch s-weigand/pyglotaran-extras/fix-setup-case-study

[codecov]

Codecov Report

Merging #41 (0a5d86f) into main (90daa5b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #41   +/-   ##
=======================================
  Coverage   40.70%   40.70%           
=======================================
  Files          22       22           
  Lines         597      597           
  Branches       77       77           
=======================================
  Hits          243      243           
  Misses        354      354           

Impacted Files	Coverage Δ
tests/io/test_setup_case_study.py	0.00% <ø> (ø)
pyglotaran_extras/io/setup_case_study.py	100.00% <100.00%> (ø)

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[jsnel]

👍