bbduk.sh edits

Carrying on from the rna-seq workflow issue, all that needs changing is "bbmap/38.90/bbduk.nf"

Line 21 & 22: 
```
	    out1=${sample_id}_clean_1.**fastq.**gz \
            out2=${sample_id}_clean_2.**fastq.**gz \
```

Line 32: 
```
	    out1=${sample_id}_clean.**fastq.**gz \
```