Made GSEA butterfly plot optional

[WackerO]

See nf-core/differentialabundance#143

PR checklist

Closes #XXX

• This comment contains a description of changes (with reason).
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[pinin4fjords]

Looks good, we'll just have to go fix the GSEA module for linting. Also, don't forget the Changelog.

[WackerO]

@pinin4fjords Linting fixed! But I'm pretty sure modules still doesn't have a changelog. Unless it was added recently and I cannot find the file?

[pinin4fjords]

Sorry, I'm an idiot, carry on :-)

[WackerO]

No no, that mistake has happened to me as well 😄