Pre-expanded Admin Course menu (#1509)

Author: damianhxy

app/views/courses/manage.html.erb

@@ -17,7 +17,7 @@
 <div class="row">
   <div class="col s12 m4">
     <ul class="collapsible" data-collapsible="accordion">
-      <li class="collapsible-menu-link">
+      <li class="collapsible-menu-link active">
         <div class="collapsible-header active"><h5>Admin Course</h5></div>
         <div class="collapsible-body">
           <ul class="options">