1609 - Do not set first item as active by default

[KaneFreeman]

Type: bug

The following has been addressed in the PR:

• [x] There is a related issue
• [x] All code matches the style guide
• [x] Unit tests are included in the PR
• [ ] For new widgets, an entry has been added to the .dojorc
• [ ] For new widgets, theme.variant() is added to the root domnode
• [ ] Any widget variant uses theme.compose like this
• [ ] WidgetProperties are exported

Description: When no active index is set, no list item is selected instead of the previous behavior of defaulting to the first item.

Resolves #1609

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widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/4SjVuYk1R7iSjwFuMFiw2PtYnFrL
✅ Preview: https://widget-test-do-git-fork-kanefreeman-bugfix-1609-first-it-46e74e.vercel.app

dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojo.widgets/9LjGM31nXubbGdfGF7PMpfsYMaKh
✅ Preview: https://dojowidgets-git-fork-kanefreeman-bugfix-1609-first-it-cf4b68.vercel.app

[codecov[bot]]

Codecov Report

Merging #1724 (cd5cc19) into master (ca3cf63) will increase coverage by 0.10%. The diff coverage is 94.73%.

@@            Coverage Diff             @@
##           master    #1724      +/-   ##
==========================================
+ Coverage   90.24%   90.35%   +0.10%     
==========================================
  Files          94       94              
  Lines        5116     5120       +4     
  Branches     1392     1398       +6     
==========================================
+ Hits         4617     4626       +9     
+ Misses        244      243       -1     
+ Partials      255      251       -4     

Impacted Files	Coverage Δ
src/list/index.tsx	81.65% <94.73%> (+1.71%)	:arrow_up:

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