Fix: Organise results folder structure by pipeline

[FriederikeHanssen]

Fixes a minor inconvenience where all results were published under the first pipeline name that came to pass, such as results/nf-core_sarek/workflowID-rnaseq, results/nf-core_sarek/workflowID-viralrecon

Tested on a samplesheet:

results
├── nf-core_atacseq
├── nf-core_demultiplex
├── nf-core_rnaseq
├── nf-core_sarek
├── nf-core_scrnaseq
└── pipeline_info

organises again the output by pipeline.