Merge pull request #2981 from karreiro/share_bug

FIX: Sharing link stood visible after using browser’s back button

app/assets/javascripts/discourse/views/share.js.es6

@@ -104,6 +104,8 @@ export default Discourse.View.extend({
   },
 
   willDestroyElement: function() {
+    this.get('controller').send('close');
+
     $('html').off('click.discoure-share-link')
              .off('mousedown.outside-share-link')
              .off('keydown.share-view');