Fixbug: $ in pindel

tasks/pindel.wdl

@@ -35,7 +35,7 @@ task pindel {
     echo -e "./input/$bam_file_name\t$mean_insert_size\t${sample_id}" > ${sample_id}_config.txt
 
     pindel -i ${sample_id}_config.txt \
-      -f $${ref_dir}/${fasta} \
+      -f ${ref_dir}/${fasta} \
       -o ./pindel_result/${sample_id} \
       -c all \
       -T 4 \