fix: invalid params used in requiredMeta of waline

[alexhua]

Fix the invalid parameters used in waline requiredMeta

Reference: https://waline.js.org/reference/client/props.html#commentsorting

requiredMeta

• 类型: string[]
• 默认值: []

设置必填项，默认匿名，可选值:

• []
• ['nick']
• ['nick', 'mail']