Fix Bug: Unable to click board submenu on mobile.

Thanks to xet7 !

Closes #2261

client/components/sidebar/sidebar.jade

@@ -10,8 +10,8 @@ template(name="sidebar")
           i.fa.fa-keyboard-o
           span {{_ 'keyboard-shortcuts' }}
       .sidebar-content.js-board-sidebar-content.js-perfect-scrollbar
-        a.hide-btn.js-hide-sidebar
-          i.fa.fa-navicon
+        //a.hide-btn.js-hide-sidebar
+        //  i.fa.fa-navicon
         unless isDefaultView
           h2
             a.fa.fa-chevron-left.js-back-home