Fixed Bug: handle subtype in lower case

[nhhaidee]

Add flags=re.IGNORECASE to handle subtype in lower case because there are 32 sequences in NCBI database have subtype in lower case

PR checklist

• [ ] This comment contains a description of changes (with reason).
• [x] If you've fixed a bug or added code that should be tested, add tests!
  • [ ] If you've added a new tool - add to the software_versions process and a regex to scrape_software_versions.py
  • [ ] If you've added a new tool - have you followed the pipeline conventions in the contribution docs
  • [ ] If necessary, also make a PR on the CFIA-NCFAD/nf-test-datasets repo
• [ ] Make sure your code lints (nf-core lint .).
• [ ] Ensure the test suite passes (nextflow run . -profile test,docker).
• [ ] Usage Documentation in docs/usage.md is updated.
• [ ] Output Documentation in docs/output.md is updated.
• [ ] CHANGELOG.md is updated.
• [ ] README.md is updated (including new tool citations and authors/contributors).

[peterk87]

Can you change the PR target to CFIA-NCFAD?

[github-actions[bot]]

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