Make dialog close icons square

[aciccarello]

Type: bug

The following has been addressed in the PR:

• [x] There is a related issue
• [x] 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:

Resolves #1575

[vercel[bot]]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployments, click below or on the icon next to each commit.

widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/AEWvFkAowY3jYTft3km47PbYHJc5
✅ Preview: https://widget-test-do-git-fork-aciccarello-1575-close-icon-siz-086a8b.vercel.app

dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojo.widgets/EDhwWXv79fo4rErra6pgmQcEFiNG
✅ Preview: https://dojowidgets-git-fork-aciccarello-1575-close-icon-size-dojo1.vercel.app

[codecov[bot]]

Codecov Report

Merging #1679 (a4e75d8) into master (7a96379) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1679   +/-   ##
=======================================
  Coverage   89.97%   89.97%           
=======================================
  Files          94       94           
  Lines        5008     5008           
  Branches     1352     1352           
=======================================
  Hits         4506     4506           
  Misses        248      248           
  Partials      254      254           

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 7a96379...e045349. Read the comment docs.