插槽supportVariable设置为 false 就不能用了

## **Describe the bug (required)** / **详细描述 bug（必填）**
插槽supportVariable设置为 false 就不能开启了

## **To Reproduce (required)** / **如何复现 bug？（必填，非常重要）**

```json
{
{
name: "append",
setter: "SlotSetter"
},
{
name: "prepend",
setter: "SlotSetter",
supportVariable: false
},
{
name: "prefix",
setter: "SlotSetter",
supportVariable: false
},
{
name: "suffix",
setter: "SlotSetter",
supportVariable: false
},
}
```

## **Screenshots (optional)** / **bug 截图（可选）**
只有 append 可以开启，其他的点了毫无反应

---

## **Environments (please complete the following information) (required):** / **请提供如下信息（必填）**
- AliLowCodeEngine version: [e.g. 1.7 ]
- AliLowCodeEngineExt version: [e.g. 1.0.6-beta.27]