tour: show editor after closing TOC

Fixes golang/go#13179

Change-Id: I270ae5be8459347db7fe989fec1cd9f2a54f0505
Reviewed-on: https://go-review.googlesource.com/17420
Reviewed-by: Russ Cox <rsc@golang.org>
diff --git a/static/js/directives.js b/static/js/directives.js
index de2e12e..3740246 100755
--- a/static/js/directives.js
+++ b/static/js/directives.js
@@ -193,6 +193,7 @@
                     $('.toc').toggle('slide', {
                         direction: 'right'
                     }, speed);
+                    $('#editor-container').show();
                 };
             }
         };