🐛 [Bug]: 自定义字号下拉框显示异常，全部显示为 Normal 了

[kagol]

Version

4.0.0

Link to minimal reproduction

复现链接：https://opentiny.github.io/tiny-editor/docs/demo/custom-toolbar

字号设置的功能是好的，但是显示不正常。

Step to reproduce

如上

What is expected

No response

What is actually happening

No response

What is your project name

Wiki

Any additional comments (optional)

No response