fix: set correct disabled property in <a> tag in SettingsItem

[shuuji3]

ref. #2767

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[shuuji3]

Maybe this is a different issue. I couldn't reproduce disabled="false" rendering with the clean installation of [email protected]:
https://stackblitz.com/edit/nuxt-starter-9e9zdh?file=app.vue

We need to check why :disable="false" does not remove the disable property and it is rendered as disable="false" instead.