Reset result when unmounted

[MickL]

Types of changes

• [ ] Bug fix (a non-breaking change which fixes an issue)
• [ ] New feature (a non-breaking change which adds functionality)
• [X] Breaking change (fix or feature that would cause existing functionality to change)

Description

https://github.com/nuxt-modules/algolia/issues/201

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes (if not applicable, please state why)