fix(mapping): duplex_umi does not reference any declaration

tasks/mapping.wdl

   String group
   String sample
   String platform
+  String? duplex_umi
+  String? read_structure
   String docker
   String cluster_config
   String disk_size

workflow.wdl

       fastq_1=tumor_fastq_1,
       fastq_2=tumor_fastq_2,
       SENTIEON_LICENSE=SENTIEON_LICENSE,
-      pl=pl,
+      duplex_umi=duplex_umi,
+      read_structure=read_structure,
+      platform=platform,
       fasta=fasta,
       ref_dir=ref_dir,
       docker=sentieon_docker,
       fastq_1=normal_fastq_1,
       fastq_2=normal_fastq_2,
       SENTIEON_LICENSE=SENTIEON_LICENSE,
+      duplex_umi=duplex_umi,
+      read_structure=read_structure,
       platform=platform,
       fasta=fasta,
       ref_dir=ref_dir,