Add a CSS class to remove padding when using mattewhite class for figures

Add a CSS class to remove padding when using mattewhite class for figures
https://bugs.webkit.org/show_bug.cgi?id=154206

Reviewed by Filip Pizlo.

* wp-content/themes/webkit/style.css:
(article .two-columns):
(article .two-columns h6):
(article .two-columns p):
(article .mattewhite):
(article .mattewhite.tightwad):
(article figure):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@196542 268f45cc-cd09-0410-ab3c-d52691b4dbfc