Select关联选择模式不支持配置右边展示表格模式

#### 描述问题：

Select关联选择模式不支持配置右边展示表格模式

#### 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. amis 版本是什么？请先在最新 beta 版本测试问题是否存在
官网样例
https://baidu.github.io/amis/zh-CN/components/form/select#%E5%85%B3%E8%81%94%E9%80%89%E6%8B%A9%E6%A8%A1%E5%BC%8F

3. 粘贴有问题的完整 `amis schema` 代码：
```
{
"type": "page",
"body": {
"type": "form",
"api": "https://3xsw4ap8wah59.cfc-execute.bj.baidubce.com/api/amis-mock/mock2/form/saveForm",
"body": [
{
"label": "关联选择模式",
"type": "select",
"name": "b",
"sortable": true,
"searchable": true,
"deferApi": "https://3xsw4ap8wah59.cfc-execute.bj.baidubce.com/api/amis-mock/mock2/form/deferOptions?label=${label}",
"selectMode": "associated",
"leftMode": "tree",
"rightMode": "table",
"columns": [
{
"name": "label",
"label": "英雄"
},
{
"name": "value",
"label": "位置"
}
],
"leftOptions": [
{
"label": "法师",
"children": [
{
"label": "诸葛亮",
"value": "zhugeliang"
}
]
},
{
"label": "战士",
"children": [
{
"label": "曹操",
"value": "caocao"
},
{
"label": "钟无艳",
"value": "zhongwuyan"
}
]
},
{
"label": "打野",
"children": [
{
"label": "李白",
"value": "libai"
},
{
"label": "韩信",
"value": "hanxin"
},
{
"label": "云中君",
"value": "yunzhongjun"
}
]
}
],
"options": [
{
"ref": "zhugeliang",
"label": "战士",
"children": [
{
"label": "A",
"value": "a"
}
]
},
{
"ref": "caocao",
"children": [
{
"label": "B",
"value": "b"
},
{
"label": "C",
"value": "c"
}
]
},
{
"ref": "zhongwuyan",
"children": [
{
"label": "D",
"value": "d"
},
{
"label": "E",
"value": "e"
}
]
}
]
}
]
}
}
```

4. 操作步骤
请简单描述一下复现的操作步骤...

Start with the Select associated-mode example linked in the issue and reproduce the supplied SDK schema using selectMode "associated" and rightMode "table". Trace the Select component's handling of rightMode and columns; done means the right-hand associated-selection panel renders the configured table without breaking the existing example.

Written by the indexing model from the issue text.