🐛 customValueOrder=0时，多个数值列的总计列头被合并到一起了

### 🏷 S2 Version / S2 版本

| Package | Version |
| -------------- | ------- |
| @antv/s2 | 2.4.6 |
| @antv/s2-react | |
| @antv/s2-react-components | |

### 💻 Sheet Type / 表格类型

- [x] PivotSheet
- [ ] TableSheet
- [ ] PivotChartSheet
- [ ] GridAnalysisSheet
- [ ] StrategySheet
- [ ] EditableSheet

### 🖋 Describe the bug / 问题描述

customValueOrder=0时，多个数值列的总计表头被合并到一起了。

期待效果

### ⌨️ Code Snapshots / 代码片段

```js

import { PivotSheet, S2DataConfig, S2Options } from '@antv/s2';
const container = document.getElementById('container');
const s2DataConfig: S2DataConfig = {
fields: {
rows: ['province', 'city'],
columns: ['type', 'sub_type'],
values: ['number', 'price'],
valueInCols: true,
// 自定义指标属性层级顺序, 即 fields.values 的顺序 (从 0 开始)
customValueOrder: 0,
},
data: [
{
"number": 7789,
"province": "浙江省",
"city": "杭州市",
"type": "家具",
"sub_type": "桌子",
"price": 1899
},
],
meta: [
{
field: 'number',
name: '数量',
},
{
field: "price",
name: "价格",
},
{
field: 'province',
name: '省份',
},
{
field: 'city',
name: '城市',
},
{
field: 'type',
name: '类别',
},
{
field: 'sub_type',
name: '子类别',
},
],
};

const s2Options: S2Options = {
width: 600,
height: 480,
cornerExtraFieldText: "度量",
totals: {
col: {
showGrandTotals: true,
showSubTotals: true,
reverseGrandTotalsLayout: true,
reverseSubTotalsLayout: true,

},
row: {
reverseGrandTotalsLayout: true,
reverseSubTotalsLayout: true,
showGrandTotals: true,
showSubTotals: true,
subTotalsDimensions: ['price'],
}
}
};

const s2 = new PivotSheet(container, s2DataConfig, s2Options);

s2.render();

```

### 🔗 Reproduction link / 复现链接

https://s2.antv.antgroup.com/examples/custom/custom-layout/#custom-value-order

### 📋 Steps to Reproduce the Bug or Issue / 重现步骤

将上面代码粘贴到链接到demo里，调整customValueOrder值为0

### 😊 Expected Behavior / 期望行为

### 😅 Current Behavior / 当前行为

_No response_

### 💻 OS / 操作系统

- [x] macOS
- [ ] Windows
- [ ] Linux
- [ ] Others / 其他

### 🌏 Browser / 浏览器

- [x] Chrome
- [ ] Edge
- [ ] Firefox
- [ ] Safari (Limited support / 有限支持)
- [ ] IE (Nonsupport / 不支持)
- [ ] Others / 其他

Use the linked custom-layout example as the reproduction entry point and run the PivotSheet configuration with values ['number', 'price'] and customValueOrder set to 0. Trace how the column totals headers are produced when both row and column totals are enabled. Done means the total headers remain separate for the multiple value columns and match the expected screenshot.

Written by the indexing model from the issue text.