revise defaults bed file path

defaults

@@ -4,7 +4,7 @@
     "docker": "registry.cn-shanghai.aliyuncs.com/pgx-docker-registry/cnvkit:0.9.7",
     "disk_size": "400",
     "cluster_config": "OnDemand bcs.a2.7xlarge img-ubuntu-vpc",
-    "bed": "oss://pgx-reference-data/bed/hg38/Exome-Agilent_V6_nochr.bed",
+    "bed": "oss://pgx-reference-data/bed/hg38/Exome-Agilent_V6_chr.bed",
     "ref_flat": "oss://pgx-reference-data/GRCh38.d1.vd1/refFlat.txt",
     "min_gap_size": "5000",
     "method": "hybrid",