Remove extraneous space in toc.html

[lambdapioneer]

What does this PR change? What problem does it solve?

In some version of Hugo (e.g. the default one at Netlify) the extraneous space causes the following error:

8:12:29 PM: $ hugo
8:12:29 PM: Error: "/opt/build/repo/themes/PaperMod/layouts/partials/toc.html:71:1": parse failed: template: partials/toc.html:71: illegal number syntax: "-"

This PR removes the extraneous space.

Was the change discussed in an issue or in the Discussions before?

Yes, in #426 - there the solution was to update the version of Hugo.

However, this is a low risk change and it makes the onboarding more pleasant for new users as they do not need extra configuration. Also, the error message does not guide them towards a possible solution (i.e. setting the Hugo version).

Test plan

I tested with unmodified version and observed the error shown above. Then I tested the modified version and the error no longer appeared.

PR Checklist

• This change adds/updates translations and I have used the template present here.
• I have enabled maintainer edits for this PR.
• This change adds a Social Icon which has a permissive license to use it.
• This change does not include any CDN resources/links.
• This change does not include any unrelated scripts such as bash and python scripts.
• This change updates the overridden internal templates from HUGO's repository.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[adityatelange]

Thanks @lambdapioneer 👍