fix problem toc-selective-expandable

[pmario]

fix problem toc-selective-expandable

This PR fixes the problem described at Talk: https://talk.tiddlywiki.org/t/issue-using-toc-selective-expandable-with-exclude/11972

<div class="tc-table-of-contents">
<<toc-selective-expandable 'TableOfContents' exclude:'[tag[done]]'>>
</div>

• I then changed the Videos tiddler to have tag “done”. While this excluded the Videos tiddler under the Learning tiddler in the Contents tab, the “expandable arrow” disappears too, which seems like a bug?

[github-actions]

Confirmed: pmario has already signed the Contributor License Agreement (see contributing.md)

[pmario]

Kudos go to @ericshulman -- Can you please test?

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[Jermolene]

Thanks @pmario