Picker的内嵌模式，值不继承父组件而被置为空，导致表格数据没有默认被选择；

#### 描述问题：
Picker的内嵌模式，值不继承父组件而被置为空，导致表格数据没有默认被选择；
非内嵌模式值继承父组件，无此问题

#### 截图或视频：

#### 如何复现（请务必完整填写下面内容）：

1. 你是如何使用 amis 的？
SDK

2. 粘贴有问题的完整 `amis schema` 代码：
```
{
"type": "page",
"body": {
"type": "form",
"name": "form1",
"debug": true,
"initApi": {
"method": "get",
"url": "/mock/blank.json",
"data": { "&": "$$" },
"requestAdaptor": "console.log(api);return api;",
"adaptor": "console.log(api);if(api.query['row']){api.query['table1']?payload['table1']=api.query['table1']:payload['table1']=[];payload['table1'].push(api.query['row']);}return payload;"
},
"controls": [
{
"type": "table",
"name": "table1",
"addable": true,
"editable": true,
"removable": true,
"columns": [{
"name": "label", "label": "Name"
}, {
"name": "position", "label": "Title"
}]
},
{
"type": "action",
"label": "穿梭器提交到表格",
"actionType": "drawer",
"drawer": {
"title": "表格2",
"body": {
"type": "form",
"name": "form2",
"target": "form1",
"controls": [{
"label": false,
"type": "transfer",
"name": "table1",
"source": "get:/mock/picker_ajax.json",
"selectMode": "table",
"joinValues": false,
"columns": [
{
"name": "label",
"label": "英雄"
},
{
"name": "position",
"label": "位置"
}
]
}]
}
}
},
{
"type": "action",
"label": "表单提交到表格",
"actionType": "drawer",
"drawer": {
"title": "表格2",
"body": {
"type": "form",
"name": "form3",
"debug": true,
"target": "form1",
"controls": [
{
"type": "text",
"name": "row.label",
"label": "英雄"
},
{
"type": "text",
"name": "row.position",
"label": "位置"
},
{
"type": "table",
"name": "row.table",
"addable": true,
"editable": true,
"removable": true,
"columns": [{
"name": "id", "label": "id"
}, {
"name": "name", "label": "name"
}]
}
]
}
}
},
{
"type": "action",
"label": "Picker提交到表格",
"actionType": "drawer",
"drawer": {
"title": "请选择",
"data":{"&":"$$","tableFixBug":"${table1}"},
"body": {
"type": "form",
"name": "form4",
"debug": true,
"target": "form1",
"controls": [
{
"label": false,
"type": "picker",
"name": "table1",
"joinValues": false,
"embed": false,
"multiple": true,
"source": "get:/mock/picker_ajax.json",
"pickerSchema": {
"mode": "table",
"name": "thelist",
"draggable": true,
"primaryField": "label",
"headerToolbar": {
"wrapWithPanel": false,
"type": "form",
"className": "text-right",
"target": "thelist",
"mode": "inline",
"controls": [
{
"type": "text",
"name": "keywords",
"addOn": {
"type": "submit",
"label": "搜索",
"level": "primary",
"icon": "fa fa-search pull-left"
}
}
]
},
"columns": [
{
"type": "text",
"name": "label",
"label": "英雄",
"sortable": true,
"toggled": true
},
{
"type": "text",
"name": "position",
"label": "位置",
"sortable": true,
"toggled": true
}
]
}
}
]
}
}
}
]
}
}
```

3. 操作步骤
请简单描述一下复现的操作步骤...

Start by reproducing the supplied SDK schema, focusing on the embedded Picker, its parent form data, and the table1 target. Compare embedded and non-embedded behavior; done means the Picker inherits the parent value and the table displays the expected default selected rows.

Written by the indexing model from the issue text.