ox-html: Tiny fix

* ox-html.el (html): Remove duplicated line.

lisp/ox-html.el

@@ -116,7 +116,6 @@
     (:html-link-use-abs-url nil "html-link-use-abs-url" org-html-link-use-abs-url)
     (:html-link-home "HTML_LINK_HOME" nil org-html-link-home)
     (:html-link-up "HTML_LINK_UP" nil org-html-link-up)
-    (:html-container "HTML_CONTAINER" nil org-html-container-element)
     (:html-mathjax "HTML_MATHJAX" nil "" space)
     (:html-link-use-abs-url nil "html-link-use-abs-url" org-html-link-use-abs-url)
     (:html-postamble nil "html-postamble" org-html-postamble)