Merge pull request #1126 from jitsi/fix-thumbnail-menu-css-class

fix: Use a separate css class for thumbnail menu

modules/UI/videolayout/RemoteVideo.js

         this.container.appendChild(spanElement);
 
         var menuElement = document.createElement('i');
-        menuElement.className = 'icon-menu-up';
+        menuElement.className = 'icon-menu';
         menuElement.title = 'Remote user controls';
         spanElement.appendChild(menuElement);