fix(modal): fix fade-modal transition effect works on enter state

[oljc]

Types of changes

• New feature
• Bug fix
• Enhancement
• Component style change
• Typescript definition change
• Documentation change
• Coding style change
• Refactoring
• Test cases
• Continuous integration
• Breaking change
• Others

Background and context

modal 组件在默认的 fade-modal 遮罩层动画下，淡入渐进效果不生效。在 #3000 提出该问题但非 v-if / v-show 逻辑导致。

iShot_2024-02-29_14.11.42.mp4

Solution

修正拼写错误导致动画缺失
修复效果：

iShot_2024-02-29_14.17.35.mp4

How is the change tested?

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues
modal	修复遮罩层 fade-modal 过渡动画在进入时不生效问题	fix fade-modal transition effect works on enter state	Closes #3000, Closes #2836

Checklist:

• Test suite passes (npm run test)
• Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others
  should be submitted to main branch)

Other information

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