fix: no-invalid-properties incorrect report when var used inside calc

[akulsr0]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request?

Fixes #223

What changes did you make? (Give an overview)

Handle the cases when var is used inside calc fn

Related Issues

Fixes #223

Is there anything you'd like reviewers to focus on?

[eslint-github-bot]

Hi @akulsr0!, thanks for the Pull Request

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[eslint-github-bot]

Hi @akulsr0!, thanks for the Pull Request

The pull request title isn't properly formatted. We ask that you update the pull request title to match this format, as we use it to generate changelogs and automate releases.

• The length of the commit message must be less than or equal to 72

To Fix: You can fix this problem by clicking 'Edit' next to the pull request title at the top of this page.

Read more about contributing to ESLint here

[nzakas]

Thanks for taking a look at this. Because there was an existing issue already assigned to someone (docs), I'm closing this in favor of #227.