fix bug: add -s into access.wdl

tasks/access.wdl

@@ -6,7 +6,7 @@ task access {
 	String disk_size
 
     command <<<
-		cnvkit.py access ${ref_dir}/${fasta} -o access-5kb-mappable.hg38.bed
+		cnvkit.py access ${ref_dir}/${fasta} -s 5000 -o access-5kb-mappable.hg38.bed
     >>>
    
     runtime {