Fix: V5 config register (#1879)

infra/conf/v5cfg/init.go

@@ -40,8 +40,6 @@ func init() {
 					return nil, err
 				}
 				return loadJSONConfig(data)
-			case []byte:
-				return loadJSONConfig(v)
 			case io.Reader:
 				data, err := buf.ReadAllToBytes(&json.Reader{
 					Reader: v,