Get rid of the DSL2 declaration in the corresponding template files

[JoseEspinosa]

Description of feature

From Nextflow version 22.4.0, the DSL2 declaration is not needed anymore at the top of 4.0 script (i.e. nextflow.enable.dsl = 2). See here. Hence, it can be removed from:

• the main.nfof the tests files of the module's template
• the main.nfof the pipeline template (not until the default version of nextflow is bumped to 22.4.0)

[ewels]

But it doesn't do any harm, right? I'm not in a rush to remove this as it'll break the pipeline for people running older versions of Nextflow, when they might work otherwise..

[JoseEspinosa]

Yep, it does no harm, even ask Paolo if it was going to raise any warning and he told me that it was not. Just open the issue to keep track of it in case we want to update the template in the future.

[mirpedrol]

Done with https://github.com/nf-core/tools/pull/3046/files