fix(theme): show blog post edit link even when no tag & not truncated

[anaclumos]

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• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
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Motivation

I was investigating why I didn't get the EditThisPost link. I figured that it was because by default the button renders when it's either truncated or one or more tag exists. However, when editUrl is set, the button should render even when post is not truncated nor there is no tags.

Test Plan

Test links

Deploy preview: https://deploy-preview-_____--docusaurus-2.netlify.app/

Related issues/PRs

None

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⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 73	🟢 100	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟠 79	🟢 100	🟢 100	🟢 100	🟢 90	Report

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[Josh-Cena]

Could you add a test post, as the PR template requires?

[slorber]

Thanks 👍 LGTM

Could you add a test post, as the PR template requires?

Looks like we already have some test posts demonstrating the problem:

• https://docusaurus.io/tests/blog/2022/04/20/dup-footnote => no edit button
• https://deploy-preview-7727--docusaurus-2.netlify.app/tests/blog/2022/04/20/dup-footnote => edit button is there: issue fixed