Fixbug: conflicting output names

tasks/vcf2maf.wdl

@@ -47,7 +47,7 @@ task vcf2maf {
   }
 
   output {
-    File vcf = "${sample_id}.INPUT.vcf"
+    File input_vcf = "${sample_id}.INPUT.vcf"
     File maf = "${basename}.maf"
   }
 }