1730 - Fix width of list item's primary span to expand to fill parent

[KaneFreeman]

Type: bug

The following has been addressed in the PR:

• There is a related issue
• All code matches the style guide
• 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:
Fix width of list item's primary span to expand to fill parent, so loading indicators appear correctly.

Resolves #1730

[vercel]

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dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojo.widgets/5mKtCCFYTy6Bb7B9nBSfi9d76AoQ
✅ Preview: https://dojowidgets-git-fork-kanefreeman-bugfix-1730-list-loa-f7f36c.vercel.app

widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/HKcN7QXp7v1uA39vaPuQ6t8XeQUJ
✅ Preview: https://widget-test-do-git-fork-kanefreeman-bugfix-1730-list-loa-187f81.vercel.app

[codecov]

Codecov Report

Merging #1743 (f0ba362) into master (3ef7917) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1743   +/-   ##
=======================================
  Coverage   90.24%   90.24%           
=======================================
  Files          94       94           
  Lines        5116     5116           
  Branches     1392     1392           
=======================================
  Hits         4617     4617           
  Misses        244      244           
  Partials      255      255           

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[agubler]

I think this is fine, all the examples seem to work still 😄