Remove parameter --gsea_run

[aghr]

Description of feature

For running a GSEA I would invoke min these two parameters --gsea_gene_sets XXXX --gsea_run true. To reduce the number of parameters it could make sense to remove --gsea_run true and run the GSEA if the user provides gene sets via --gsea_gene_set XXXX.

[WackerO]

Hey @aghr,
as mentioned in #243, there is now also gprofiler which shares the gene set param but can be run independently, so it is necessary to have the gsea_run param to enable running either of the two enrichment tools (or none) even when providing a file.
I'm closing this issue, feel free to reopen if you have any more input regarding this.