Run FastqScreen with subsampled data if available

[pontushojer]

SeqFu stats runs on the raw input ATM which makes sense if we want to have the option to get the raw read/base count while subsampling for speedups with the other tools. I also added a comment for this. Let me know what you think!

PR checklist

• This comment contains a description of changes (with reason).
• If you've fixed a bug or added code that should be tested, add tests!
• 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 nf-core/seqinspector branch on the nf-core/test-datasets repository.
• Make sure your code lints (nf-core lint).
• Ensure the test suite passes (nf-test test main.nf.test -profile test,docker).
• Check for unexpected warnings in debug mode (nextflow run . -profile debug,test,docker --outdir <OUTDIR>).
• 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).

[nf-core-bot]

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