Currently, it's hard to output an SVG in the comment function without a lot of extra effort. So this adds a simple border to the author avatar and removes previous code related to SVGs and/or Genericons.
Props laurelfulford.
Fixes#38403.
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This was previously fixed in [38837], but it wasn't really the correct answer, to fix it in the theme. So, [38837] is reverted in this commit, and the Twenty Seventeen actions causing problems are unhooked before tests are run.
See #38372.
Built from https://develop.svn.wordpress.org/trunk@38850
git-svn-id: http://core.svn.wordpress.org/trunk@38793 1a063a9b-81f0-0310-95a4-ce76da25c4cd