[Bug] Can not delete vertex labels when use standalone mode and set server.role=computer

### Bug Type (问题类型)

rest-api (结果不合预期)

### Before submit

- [X] 我已经确认现有的 [Issues](https://github.com/apache/hugegraph/issues) 与 [FAQ](https://hugegraph.apache.org/docs/guides/faq/) 中没有相同 / 重复问题 (I have confirmed and searched that there are no similar problems in the historical issue and documents)

### Environment (环境信息)

- Server Version: 1.0.0 (Apache Release Version)
- Backend: RocksDB x nodes, HDD or SSD
- OS: xx CPUs, xx G RAM, Ubuntu 2x.x / CentOS 7.x
- Data Size: xx vertices, xx edges

### Expected & Actual behavior (期望与实际表现)

```
curl -X POST http://localhost:8080/graphs/hugegraph/schema/propertykeys \
-H "Content-Type: application/json" \
-d '
{
"name": "name",
"data_type": "TEXT",
"cardinality": "SINGLE"
}
';

curl -X POST http://localhost:8080/graphs/hugegraph/schema/propertykeys \
-H "Content-Type: application/json" \
-d '
{
"name": "age",
"data_type": "INT",
"cardinality": "SINGLE"
}
';

curl -X POST http://localhost:8080/graphs/hugegraph/schema/vertexlabels \
-H "Content-Type: application/json" \
-d '{
"name": "person",
"id_strategy": "DEFAULT",
"properties": [
"name",
"age"
],
"primary_keys": [
"name"
],
"nullable_keys": [],
"enable_label_index": true
}
';

curl -X DELETE http://localhost:8080/graphs/hugegraph/schema/vertexlabels/person ;

```

### Vertex/Edge example (问题点 / 边数据举例)

```javascript
curl -X DELETE http://localhost:8080/graphs/hugegraph/schema/vertexlabels/person
```
return :
```
Can't schedule task on non-master server
```
```

### Schema [VertexLabel, EdgeLabel, IndexLabel] (元数据结构)

_No response_