eur-lex: always display the toggle button.

There is a weird interaction between the resize handler and the overflow
scrollers, sometimes making it impossible to select the resize handler
anymore. Always display the toggle button to at least have that as a
fallback.

eur-lex/eur-lex_toc.user.js

@@ -105,9 +105,7 @@ visibility_button.onclick = (function() {
   }
 })();
 
-if (! has_css_resize) {
-  toc.appendChild(visibility_button);
-}
+toc.appendChild(visibility_button);
 if (article_titles.snapshotLength > 0) {
   toc_ltr.appendChild(h1_articles);
   toc_ltr.appendChild(ol_articles);