fix bug

defaults

@@ -2,5 +2,5 @@
     "bcftools_docker": "registry.cn-shanghai.aliyuncs.com/pgx-docker-registry/bcftools:v1.9",
     "disk_size": "200",
     "cluster_config": "OnDemand bcs.a2.large img-ubuntu-vpc",
-    "vcf": ['oss://share-data-temp/TNBC/vcf/FUSCCTNBC083_pon.vcf', 'oss://share-data-temp/TNBC/vcf/FUSCCTNBC330_pon.vcf', 'oss://share-data-temp/TNBC/vcf/FUSCCTNBC467_pon.vcf']
+    "vcf": ["oss://share-data-temp/TNBC/vcf/FUSCCTNBC083_pon.vcf", "oss://share-data-temp/TNBC/vcf/FUSCCTNBC330_pon.vcf", "oss://share-data-temp/TNBC/vcf/FUSCCTNBC467_pon.vcf"]
 }