tweak TODO string in test_yml_builder.py

[ewels]

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[codecov]

Codecov Report

Merging #966 (67a5994) into dev (398479c) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

❗ Current head 67a5994 differs from pull request most recent head f666c05. Consider uploading reports for the commit f666c05 to get more accurate results

@@            Coverage Diff             @@
##              dev     #966      +/-   ##
==========================================
- Coverage   69.31%   69.30%   -0.02%     
==========================================
  Files          34       34              
  Lines        4224     4225       +1     
==========================================
  Hits         2928     2928              
- Misses       1296     1297       +1     

Impacted Files	Coverage Δ
nf_core/modules/create.py	59.57% <0.00%> (-0.32%)	⬇️
nf_core/modules/test_yml_builder.py	16.04% <ø> (ø)

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