Fix scroll into view in TOC

[MihkelAuv]

Modern template should scroll last active list item into view:

docfx/templates/modern/src/toc.ts

Lines 39 to 43 in e0f8953

	const activeElements = tocContainer.querySelectorAll('li.active')
	const lastActiveElement = activeElements[activeElements.length - 1]
	if (lastActiveElement) {
	lastActiveElement.scrollIntoView({ block: 'nearest' })
	}

But currently, list items do not get the class "active" assigned. This PR fixes this.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (1426d18) 77.00% compared to head (cf70059) 76.99%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8898      +/-   ##
==========================================
- Coverage   77.00%   76.99%   -0.01%     
==========================================
  Files         605      605              
  Lines       25036    25036              
==========================================
- Hits        19278    19277       -1     
- Misses       5758     5759       +1     

see 1 file with indirect coverage changes

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[yufeih]

Aha, nice catch!