Make Dialog material overrides styles more specific

[agubler]

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:

Makes the overriding styles for the material theme more specific than the composed styles

[vercel]

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dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojo.widgets/9mbcU8RdQ4uzqchPHx542CN1bgxg
✅ Preview: https://dojowidgets-git-fork-agubler-dialog-material-css-dojo1.vercel.app

widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/72rJUpr1AUV8bcYA1LH3X7ikvCa2
✅ Preview: https://widget-test-docs-git-fork-agubler-dialog-material-css-dojo1.vercel.app

[codecov]

Codecov Report

Merging #1759 (f5938a5) into master (05f2d0a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1759   +/-   ##
=======================================
  Coverage   90.57%   90.57%           
=======================================
  Files          95       95           
  Lines        5232     5232           
  Branches     1429     1429           
=======================================
  Hits         4739     4739           
  Misses        241      241           
  Partials      252      252           

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