Fix WebUI Auto TMM context menu bug

When multiple torrents are selected with different Auto TMM values, the Auto TMM context menu option is hidden. This option is never unhidden, requiring a refresh of the page.

src/webui/www/private/scripts/contextmenu.js

@@ -345,10 +345,13 @@ var TorrentsTableContextMenu = new Class({
         else if (!there_are_paused && !there_are_force_start)
             this.hideItem('Start');
 
-        if (!all_are_auto_tmm && there_are_auto_tmm)
+        if (!all_are_auto_tmm && there_are_auto_tmm) {
             this.hideItem('AutoTorrentManagement');
-        else
+        }
+        else {
+            this.showItem('AutoTorrentManagement');
             this.setItemChecked('AutoTorrentManagement', all_are_auto_tmm);
+        }
 
     },