picker组件内嵌模式，从列表删除非首页的项，不会更新保存

#### 如何复现（请务必完整填写下面内容）：
picker组件，内嵌模式。
从crud中选择多项，包含不在crud第一页的项，保存。
从picker列表中删除不在crud第一页的项，保存。可以发现，提交的请求中，依然保存删除的项的id。
如果从crud中去掉勾选再保存，正常。如果非内嵌模式，正常。

2. amis 版本是什么？
2.8.0

4. 粘贴有问题的完整 `amis schema` 代码：
把文档中picker内嵌模式的示例代码，稍做修改——只是换掉source，可以翻页
```
{
"type": "page",
"body": {
"type": "form",
"api": "https://3xsw4ap8wah59.cfc-execute.bj.baidubce.com/api/amis-mock/mock2/form/saveForm",
"body": [
{
"type": "picker",
"name": "type4",
"joinValues": true,
"valueField": "id",
"labelField": "engine",
"label": "Picker",
"embed": true,
"source": "https://3xsw4ap8wah59.cfc-execute.bj.baidubce.com/api/amis-mock/mock2/sample",
"size": "lg",
"value": "4,5",
"multiple": true,
"pickerSchema": {
"mode": "table",
"name": "thelist",
"quickSaveApi": "https://3xsw4ap8wah59.cfc-execute.bj.baidubce.com/api/amis-mock/mock2/sample/bulkUpdate",
"quickSaveItemApi": "https://3xsw4ap8wah59.cfc-execute.bj.baidubce.com/api/amis-mock/mock2/sample/$id",
"draggable": true,
"headerToolbar": {
"wrapWithPanel": false,
"type": "form",
"className": "text-right",
"target": "thelist",
"mode": "inline",
"body": [
{
"type": "input-text",
"name": "keywords",
"addOn": {
"type": "submit",
"label": "搜索",
"level": "primary",
"icon": "fa fa-search pull-left"
}
}
]
},
"columns": [
{
"name": "engine",
"label": "Rendering engine",
"sortable": true,
"searchable": true,
"type": "text",
"toggled": true
},
{
"name": "browser",
"label": "Browser",
"sortable": true,
"type": "text",
"toggled": true
},
{
"name": "platform",
"label": "Platform(s)",
"sortable": true,
"type": "text",
"toggled": true
},
{
"name": "version",
"label": "Engine version",
"quickEdit": true,
"type": "text",
"toggled": true
},
{
"name": "grade",
"label": "CSS grade",
"quickEdit": {
"mode": "inline",
"type": "select",
"options": [
"A",
"B",
"C",
"D",
"X"
],
"saveImmediately": true
},
"type": "text",
"toggled": true
},
{
"type": "operation",
"label": "操作",
"width": 100,
"buttons": [
{
"type": "button",
"icon": "fa fa-eye",
"actionType": "dialog",
"dialog": {
"title": "查看",
"body": {
"type": "form",
"body": [
{
"type": "static",
"name": "engine",
"label": "Engine"
},
{
"type": "divider"
},
{
"type": "static",
"name": "browser",
"label": "Browser"
},
{
"type": "divider"
},
{
"type": "static",
"name": "platform",
"label": "Platform(s)"
},
{
"type": "divider"
},
{
"type": "static",
"name": "version",
"label": "Engine version"
},
{
"type": "divider"
},
{
"type": "static",
"name": "grade",
"label": "CSS grade"
},
{
"type": "divider"
},
{
"type": "html",
"html": "

添加其他 Html 片段 需要支持变量替换（todo）.

"
}
]
}
}
},
{
"type": "button",
"icon": "fa fa-pencil",
"actionType": "dialog",
"dialog": {
"position": "left",
"size": "lg",
"title": "编辑",
"body": {
"type": "form",
"name": "sample-edit-form",
"api": "https://3xsw4ap8wah59.cfc-execute.bj.baidubce.com/api/amis-mock/mock2/sample/$id",
"body": [
{
"type": "input-text",
"name": "engine",
"label": "Engine",
"required": true
},
{
"type": "divider"
},
{
"type": "input-text",
"name": "browser",
"label": "Browser",
"required": true
},
{
"type": "divider"
},
{
"type": "input-text",
"name": "platform",
"label": "Platform(s)",
"required": true
},
{
"type": "divider"
},
{
"type": "input-text",
"name": "version",
"label": "Engine version"
},
{
"type": "divider"
},
{
"type": "select",
"name": "grade",
"label": "CSS grade",
"options": [
"A",
"B",
"C",
"D",
"X"
]
}
]
}
}
},
{
"type": "button",
"icon": "fa fa-times text-danger",
"actionType": "ajax",
"confirmText": "您确认要删除?",
"api": "delete:https://3xsw4ap8wah59.cfc-execute.bj.baidubce.com/api/amis-mock/mock2/sample/$id"
}
],
"toggled": true
}
]
}
}
]
}
}
```

Start by reproducing the embedded picker flow from the supplied schema: select items beyond the first CRUD page, then remove one from the picker list and submit. Trace how embedded picker selections are tracked across pagination; done means the submitted request no longer contains the removed item's ID, while the other selections remain intact.

Written by the indexing model from the issue text.