uni-data-picker在readonly和map属性同时配置时，数据异步加载时的bug

# 版本信息
HbuilderX 5.15
uni-ui 中 uni-data-picker版本 2.0.2
vue3

## 问题代码片段
```vue

{{ error }}


{{ data[data.length - 1].text }}


请选择



```

## uni-data-picker中涉及readonly的回显处理片段
```javascript
_processReadonly(dataList, value) {
var isTree = dataList.findIndex(item => {
return item.children;
});
if (isTree > -1) {
let inputValue;
if (Array.isArray(value)) {
inputValue = value[value.length - 1];
if (typeof inputValue === 'object' && inputValue.value) {
inputValue = inputValue.value;
}
} else {
inputValue = value;
}
this.inputSelected = this._findNodePath(inputValue, this.localdata);
return;
}

if (!this.hasValue) {
this.inputSelected = [];
return;
}

let result = [];
if (Array.isArray(value)) {
for (let i = 0; i < value.length; i++) {
var val = value[i];
var item = dataList.find(v => {
return v.value == val;
});
if (item) {
result.push(item);
}
}
} else {
let item = dataList.find(v => {
return v.value == value;
});
if (item) {
result.push(item);
}
}
if (result.length) {
this.inputSelected = result;
}
},
```
问题描述：在传入的localData和readonly属性均依赖异步接口获取时，存在数据竞态更新导致的回显问题
- 排查发现uni-data-picker代码实现中，在dataList.find中使用的是硬编码的value，并未根据传入的map处理，此外匹配失败时未正确清空this.inputSelected的值，使得组件偶尔回显上一次匹配的值

Start with uni-data-picker's _processReadonly method and trace how asynchronous localdata and readonly updates reach dataList.find. Reproduce the issue using the supplied Vue 3 example with map set to name/id. Done means the readonly value resolves through the configured mapping and a failed match cannot leave the previous selection displayed.

Written by the indexing model from the issue text.