Fasta test file containing seatoxin reference sequences incorrectly named

[JoseEspinosa]

Description of feature

The test file for seatoxin reference sequences has a typo and needs to be renamed from setoxin-ref.fa to seatoxin-ref.fa (file here. All instances referencing this file should be updated (e.g. samplesheet)

[luisas]

Several modules use setoxin for the test. Those will have to be updated too.