[BUG] defaultPreferences 无法设置层级配置

[hacke2]

描述你的问题（Describe the bug）

clientApp 里传入 defaultPreferences 无法设置层级配置

复现路径（To Reproduce）

opts.defaultPreferences = {
    "aaa.bbb": {
      "ccc": "ddd",
    }
}

package.json:

{
  "publisher": "a",
  "name": "aaa",
  "main": ".",
  "engines": {
    "vscode": "^1.22.0"
  },
  "activationEvents": [
    "*"
  ],
  "contributes": {
    "configuration": {
      "type": "object",
      "title": "Test",
      "properties": {
        "aaa.bbb.ccc": {
          "type": [
              "null",
              "string"
          ],
          "default": null,
          "description": ""
        }
      }
    }
  }
}

插件读取

const vscode = require('vscode');

exports.activate = () => {
  vscode.window.showInformationMessage(JSON.stringify(vscode.workspace.getConfiguration('aaa')))
}

结果：

预期表现（Expected behavior）

之前是能读取到的

问题截图（Screenshots）

环境信息（Environment）

• OS: [e.g. macOS 11.2 Apple M1/Windows10/Windows11]
• Browser [e.g. chrome, safari]
• OpenSumi Version [e.g. 2.13.0]

补充信息（Additional context）

[stale[bot]]

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