Remove dodgy sniffer code from samplesheet_check.py

[jfy133]

See nf-core/funcscan#227 for more info

Closes #1539

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 #2194 (6de786c) into dev (7f30502) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #2194   +/-   ##
=======================================
  Coverage   71.57%   71.57%           
=======================================
  Files          77       77           
  Lines        8369     8369           
=======================================
  Hits         5990     5990           
  Misses       2379     2379           

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[edmundmiller]

Love it! Maybe add a TODO to check for a header?

[jfy133]

Love it! Maybe add a TODO to check for a header?

I think @Midnighter said we actually already check for this when checking for the actual expected header string

[Midnighter]

Love it! Maybe add a TODO to check for a header?

I think @Midnighter said we actually already check for this when checking for the actual expected header string

Indeed! Check lines 194-202.