[Bugfix Backport] Fix Container Height

[samhinshaw]

Backport of #7313 for plotly.js v2.

Fixes #7312.
@plotly/plotly_js

[archmoj]

Thanks very much @samhinshaw for your help in catching the bug as well as this PR.
It was a great experience pair programming with you on this issue as well as on other upcoming PRs that we will merge into the master branch (as part of the v3 release).
FYI - I tested your proposed fix on CircleCI on top of the master branch and all the tests pass.
https://app.circleci.com/pipelines/github/plotly/plotly.js/11732/workflows/9e1ac8eb-ee34-48b3-a450-78e65818d1fd?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-checks-link&utm_content=summary

Therefore I move forward and merge this PR into the v2 branch, then release v2.35.3 patch to unblock the DE release.
Thank you!
And have a good weekend.