fix(vue3): inject value showing default over falsy value

[psevertson]

Description

The Injects values are incorrectly coalescing falsy values to their default values when the component is written in Options mode.

Additional context

If a parent component provides a falsy value (false, null, 0, "", etc.), then a child component written in Options mode will incorrectly coalese that and show the default value given for the inject.

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What is the purpose of this pull request?

• [x] Bug fix
• [ ] New Feature
• [ ] Documentation update
• [ ] Other

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• [x] Read the Contributing Guidelines.
• [x] Read the Pull Request Guidelines and follow the Commit Convention.
• [x] Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• [x] Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).