fix material card header margin

[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: Allows material card title margin styles if it is the first element. To do so we need to check that there isn't a media element or header before the title.

Resolves #1588

[vercel[bot]]

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dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojo.widgets/DAoU8TR4QLdzUbqSeEhPn8PLtzSx
✅ Preview: https://dojowidgets-git-fork-aciccarello-1588-card-header-dojo1.vercel.app

widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/6EH2B6GXiTaW1xHUc5cmexBnodvy
✅ Preview: https://widget-test-docs-git-fork-aciccarello-1588-card-header-dojo1.vercel.app

[codecov[bot]]

Codecov Report

Merging #1683 (2dd4342) into master (ebbad1b) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1683   +/-   ##
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  Coverage   89.98%   89.98%           
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  Files          94       94           
  Lines        5012     5012           
  Branches     1354     1354           
=======================================
  Hits         4510     4510           
  Misses        248      248           
  Partials      254      254           

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