SNP_calling.nf: change RG tag order

src/SNP_calling.nf

@@ -146,8 +146,8 @@ process mapping_fastq {
 """
 bowtie2 --very-sensitive -p ${task.cpus} -x ${index_id} \
 --rg-id ${sample_name} \
---rg SM:${sample_name} \
 --rg PL:Illumina \
+--rg SM:${sample_name} \
 -1 ${reads[0]} -2 ${reads[1]} 2> \
 ${pair_id}_bowtie2_report.txt | \
 samtools view -Sb - > ${pair_id}.bam