Bump nextcloud-vue from 0.2.0 to 0.3.1 in /settings

Bumps [nextcloud-vue](https://github.com/nextcloud/vue-components) from 0.2.0 to 0.3.1.
- [Release notes](https://github.com/nextcloud/vue-components/releases)
- [Commits](https://github.com/nextcloud/vue-components/compare/v0.2.0...v0.3.1

)

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