Add JS style changes.

Thanks @rspeicher

app/assets/javascripts/application.js.coffee

@@ -232,7 +232,8 @@ $ ->
       $this = $(this)
       $thisIcon = $this.find 'i'
       if $thisIcon.hasClass('fa-angle-double-right')
-        $thisIcon.removeClass('fa-angle-double-right')
+        $thisIcon
+          .removeClass('fa-angle-double-right')
           .addClass('fa-angle-double-left')
         $this
           .closest('aside')
@@ -242,7 +243,8 @@ $ ->
           .removeClass('right-sidebar-expanded')
           .addClass('right-sidebar-collapsed')
       else
-        $thisIcon.removeClass('fa-angle-double-left')
+        $thisIcon
+          .removeClass('fa-angle-double-left')
           .addClass('fa-angle-double-right')
         $this
           .closest('aside')