4250 meta key linting

[DLBPointon]

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

Fix, hopefully, makes the regex found in L307 of /nf_core/modules/lint/main_nf.py more specific so it is only looking for {meta.<something>} variables rather than "meta" the string in script.

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[DLBPointon]

Ah ok, the main intention was to catch the def block in the script block.

I was focusing on inside the """ string block """