Update inline_grids_spec.js

[Divine-peace]

Replaced var with const

Added const instead of var

Fixes #11487

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[codeclimate]

Code Climate has analyzed commit 523eed7 and detected 0 issues on this pull request.

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[github-actions]

This pull request generated screenshots of many common pages in the running app. You should be able to download and view them here:
https://github.com/publiclab/plots2/suites/9024875246/artifacts/416421782

[TildaDares]

Amazing work @Divine-peace. Thank you!

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[TildaDares]

Congratulations on merging your PR @Divine-peace 🎉🎉