can not get cluster name in registry config 'service.vgroupMapping.account-service-fescar-service-group', please make sure registry config correct

seata-server 启动后，启动account-service报错。

```
can not get cluster name in registry config 'service.vgroupMapping.account-service-fescar-service-group', please make sure registry config correct
```

https://github.com/seata/seata-samples/blob/master/springcloud-jpa-seata/account-service/src/main/resources/file.conf

把
```
vgroupMapping.my_test_tx_group = "default"
```
改成

```
vgroupMapping.account-service-fescar-service-group = "default"
```

不再报错

Start with springcloud-jpa-seata/account-service/src/main/resources/file.conf and compare the configured vgroupMapping key with the service group named in the startup error. Run seata-server, then start account-service to verify that it no longer reports a missing cluster name.

Written by the indexing model from the issue text.