Bug 1273247 - Reenable autofocus test, r=automatedtester

Differential Revision: https://phabricator.services.mozilla.com/D14251

--HG--
extra : moz-landing-system : lando

testing/web-platform/meta/html/semantics/selectors/pseudo-classes/focus-autofocus.html.ini

@@ -1,2 +0,0 @@
-[focus-autofocus.html]
-  disabled: https://bugzilla.mozilla.org/show_bug.cgi?id=1273247